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    Work: Find the solution of equation （4500×12×0.9-60%×70X×6.95%）÷（40%×70X+50%×70X） = 3.8% .
    Question type: Equation
    Solution:Original question:

(

4500

×

12

×

9 10

−

60 100

×

70

X

×

139 2000

)

÷

(

40 100

×

70

X

+

50 100

×

70

X

)

=

19 500

Multiply both sides of the equation by:

(

40 100

×

70

X

+

50 100

×

70

X

)

(

4500

×

12

×

9 10

−

60 100

×

70

X

×

139 2000

)

=

19 500

(

40 100

×

70

X

+

50 100

×

70

X

)

    Remove a bracket on the left of the equation:：

4500

×

12

×

9 10

−

60 100

×

70

X

×

139 2000

=

19 500

(

40 100

×

70

X

+

50 100

×

70

X

)

    Remove a bracket on the right of the equation:：

4500

×

12

×

9 10

−

60 100

×

70

X

×

139 2000

=

19 500

×

40 100

×

70

X

+

19 500

×

50 100

×

70

X

    The equation is reduced to :

48600

−

2919 1000

X

=

133 125

X

+

133 100

X

    The equation is reduced to :

48600

−

2919 1000

X

=

1197 500

X

    Transposition :

-

2919 1000

X

−

1197 500

X

=

-

48600

    Combine the items on the left of the equation:

-

5313 1000

X

=

-

48600

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

48600

=

5313 1000

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 :

5313 1000

X

=

48600

    The coefficient of the unknown number is reduced to 1 :

X

=

48600

÷

5313 1000

=

48600

×

1000 5313

=

16200

×

1000 1771

    We obtained :

X

=

16200000 1771

    This is the solution of the equation.

    Convert the result to decimal form :

X

=

9147.374365

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