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On line solution of multivariate equations：
    First set the elements of the equation (i.e. the number of unknowns), then click the "Next" button to enter the coefficients of each element of the equation set, and click the "Next" button to obtain the solution of the equation set.
    Note that the coefficients of each element of the equation system can only be numbers, not algebraic expressions (including mathematical functions).
    Current location：Equations > Multivariate equations > Answer
detailed information：
The input equation set is:
 180x + 80y + 340z = 20    (1)
 130x + 60y + 230z = 22    (2)
 380x + 120y + 670z = 70    (3)
Question solving process:

Multiply both sides of equation (1) by 13
Divide the two sides of equation (1) by 18, the equation can be obtained:
         130x + 
520
9
y + 
2210
9
z = 
130
9
    (4)
, then subtract both sides of equation (4) from both sides of equation (2), the equations are reduced to:
 180x + 80y + 340z = 20    (1)
 
20
9
y - 
140
9
z = 
68
9
    (2)
 380x + 120y + 670z = 70    (3)

Multiply both sides of equation (1) by 19
Divide the two sides of equation (1) by 9, the equation can be obtained:
         380x + 
1520
9
y + 
6460
9
z = 
380
9
    (5)
, then subtract both sides of equation (5) from both sides of equation (3), the equations are reduced to:
 180x + 80y + 340z = 20    (1)
 
20
9
y - 
140
9
z = 
68
9
    (2)
- 
440
9
y - 
430
9
z = 
250
9
    (3)

Multiply both sides of equation (2) by 22, the equation can be obtained:
         
440
9
y - 
3080
9
z = 
1496
9
    (6)
, then add the two sides of equation (6) to both sides of equation (3), the equations are reduced to:
 180x + 80y + 340z = 20    (1)
 
20
9
y - 
140
9
z = 
68
9
    (2)
-390z = 194    (3)

Multiply both sides of equation (3) by 14
Divide both sides of equation (3) by 351, get the equation：
        - 
1820
117
z = 
2716
351
    (7)
, then subtract both sides of equation (7) from both sides of equation (2), get the equation：
 180x + 80y + 340z = 20    (1)
 
20
9
y = - 
64
351
    (2)
-390z = 194    (3)

Multiply both sides of equation (3) by 34
Divide both sides of equation (3) by 39, get the equation：
        -340z = 
6596
39
    (8)
, then add the two sides of equation (8) to both sides of equation (1), get the equation：
 180x + 80y = 
7376
39
    (1)
 
20
9
y = - 
64
351
    (2)
-390z = 194    (3)

Multiply both sides of equation (2) by 36, get the equation：
         80y = - 
256
39
    (9)
, then subtract both sides of equation (9) from both sides of equation (1), get the equation：
 180x = 
2544
13
    (1)
 
20
9
y = - 
64
351
    (2)
 z = - 
97
195
    (3)

The coefficient of the unknown number is reduced to 1, and the equations are reduced to：
 x = 
212
195
    (1)
 y = - 
16
195
    (2)
 z = - 
97
195
    (3)


Therefore, the solution of the equation set is:
x = 
212
195
y = - 
16
195
z = - 
97
195


Convert the solution of the equation set to decimals:
x = 1.087179
y = -0.082051
z = -0.497436

解方程组的详细方法请参阅：《多元一次方程组的解法》
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