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On line Solution of Monovariate Equation：
    Input any unary equation directly, and then click the "Next" button to obtain the solution of the equation.
    It supports equations that contain mathematical functions.
    Current location：Equations > Monovariate Equation > The history of univariate equation calculation > Answer

    Overview: 1 questions will be solved this time.Among them
           ☆1 equations

[ 1/1 Equation]
    Work: Find the solution of equation x+30/（1+20%）-x/（1+30%） = 4 .
    Question type: Equation
    Solution:Original question:
      x + 30 ÷ (1 +
20
100
) − x ÷ (1 +
30
100
) = 4
     Multiply both sides of the equation by:(1 +
20
100
)
      x (1 +
20
100
) + 30 − x ÷ (1 +
30
100
) × (1 +
20
100
) = 4(1 +
20
100
)
    Remove a bracket on the left of the equation:：
      x × 1 + x ×
20
100
 + 30 − x ÷ (1 +
30
100
) × (1 +
20
100
) = 4(1 +
20
100
)
    Remove a bracket on the right of the equation:：
      x × 1 + x ×
20
100
 + 30 − x ÷ (1 +
30
100
) × (1 +
20
100
) = 4 × 1 + 4 ×
20
100
    The equation is reduced to :
      x × 1 + x ×
20
100
 + 30 − x ÷ (1 +
30
100
) × (1 +
20
100
) = 4 +
4
5
    The equation is reduced to :
     
6
5
 x + 30 − x ÷ (1 +
30
100
) × (1 +
20
100
) =
24
5
     Multiply both sides of the equation by:(1 +
30
100
)
     
6
5
 x (1 +
30
100
) + 30(1 +
30
100
) − x (1 +
20
100
) =
24
5
(1 +
30
100
)
    Remove a bracket on the left of the equation:
     
6
5
 x × 1 +
6
5
 x ×
30
100
 + 30(1 +
30
100
) − x (1 +
20
100
) =
24
5
(1 +
30
100
)
    Remove a bracket on the right of the equation:：
     
6
5
 x × 1 +
6
5
 x ×
30
100
 + 30(1 +
30
100
) − x (1 +
20
100
) =
24
5
 × 1 +
24
5
 ×
30
100
    The equation is reduced to :
     
6
5
 x +
9
25
 x + 30(1 +
30
100
) − x (1 +
20
100
) =
24
5
 +
36
25
    The equation is reduced to :
     
39
25
 x + 30(1 +
30
100
) − x (1 +
20
100
) =
156
25
    Remove a bracket on the left of the equation:
     
39
25
 x + 30 × 1 + 30 ×
30
100
 − x (1 +
20
100
) =
156
25
    The equation is reduced to :
     
39
25
 x + 30 + 9 − x (1 +
20
100
) =
156
25
    The equation is reduced to :
     
39
25
 x + 39 − x (1 +
20
100
) =
156
25
    Remove a bracket on the left of the equation:
     
39
25
 x + 39 − x × 1 − x ×
20
100
 =
156
25
    The equation is reduced to :
     
9
25
 x + 39 =
156
25

    Transposition :
     
9
25
 x =
156
25
 − 39

    Combine the items on the right of the equation:
     
9
25
 x = -
819
25

    The coefficient of the unknown number is reduced to 1 :
      x = -
819
25
 ÷
9
25
        = -
819
25
 ×
25
9
        = - 91 × 1

    We obtained :
      x = - 91
    This is the solution of the equation.



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