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    Work: Find the solution of equation （1050×12-70%×60X×7.2%）÷（30%×60X+2%×60X） = 3.8% .
    Question type: Equation
    Solution:Original question:

(

1050

×

12

−

70 100

×

60

X

×

36 500

)

÷

(

30 100

×

60

X

+

2 100

×

60

X

)

=

19 500

Multiply both sides of the equation by:

(

30 100

×

60

X

+

2 100

×

60

X

)

(

1050

×

12

−

70 100

×

60

X

×

36 500

)

=

19 500

(

30 100

×

60

X

+

2 100

×

60

X

)

    Remove a bracket on the left of the equation:：

1050

×

12

−

70 100

×

60

X

×

36 500

=

19 500

(

30 100

×

60

X

+

2 100

×

60

X

)

    Remove a bracket on the right of the equation:：

1050

×

12

−

70 100

×

60

X

×

36 500

=

19 500

×

30 100

×

60

X

+

19 500

×

2 100

×

60

X

    The equation is reduced to :

12600

−

378 125

X

=

171 250

X

+

57 1250

X

    The equation is reduced to :

12600

−

378 125

X

=

456 625

X

    Transposition :

-

378 125

X

−

456 625

X

=

-

12600

    Combine the items on the left of the equation:

-

2346 625

X

=

-

12600

    By shifting the terms and changing the symbols on toth sides of the equation, we obtain :

12600

=

2346 625

X

    If the left side of the equation is equal to the right side, then the right side must also be equal to the left side, that is :

2346 625

X

=

12600

    The coefficient of the unknown number is reduced to 1 :

X

=

12600

÷

2346 625

=

12600

×

625 2346

=

2100

×

625 391

    We obtained :

X

=

1312500 391

    This is the solution of the equation.

    Convert the result to decimal form :

X

=

3356.777494

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