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    Work: Find the solution of equation 3*（N*129*0.2+400） = N*129*0.2+400 .
    Question type: Equation
    Solution:Original question:

3

(

N

×

129

×

1 5

+

400

)

=

N

×

129

×

1 5

+

400

    Remove the bracket on the left of the equation:

Left side of the equation =

3

N

×

129

×

1 5

+

3

×

400

=

387 5

N

+

1200

    The equation is transformed into :

387 5

N

+

1200

=

N

×

129

×

1 5

+

400

Right side of the equation =

N

×

129 5

+

400

    The equation is transformed into :

387 5

N

+

1200

=

129 5

N

+

400

    Transposition :

387 5

N

−

129 5

N

=

400

−

1200

    Combine the items on the left of the equation:

258 5

N

=

400

−

1200

    Combine the items on the right of the equation:

258 5

N

=

-

800

    The coefficient of the unknown number is reduced to 1 :

N

=

-

800

÷

258 5

=

-

800

×

5 258

=

-

400

×

5 129

    We obtained :

N

=

-

2000 129

    This is the solution of the equation.

    Convert the result to decimal form :

N

=

- 15.503876

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