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    Work: Find the solution of equation 3000+4000x = 21000*（2400x—20000/200） .
    Question type: Equation
    Solution:Original question:

3000

+

4000

x

=

21000

(

2400

x

−

20000

÷

200

)

    Remove the bracket on the right of the equation:

Right side of the equation =

21000

×

2400

x

−

21000

×

20000

÷

200

=

50400000

x

−

2100000

    The equation is transformed into :

3000

+

4000

x

=

50400000

x

−

2100000

    Transposition :

4000

x

−

50400000

x

=

-

2100000

−

3000

    Combine the items on the left of the equation:

-

50396000

x

=

-

2100000

−

3000

    Combine the items on the right of the equation:

-

50396000

x

=

-

2103000

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

2103000

=

50396000

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 :

50396000

x

=

2103000

    The coefficient of the unknown number is reduced to 1 :

x

=

2103000

÷

50396000

=

2103000

×

1 50396000

=

2103

×

1 50396

    We obtained :

x

=

2103 50396

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

0.04173

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