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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

Left side of the equation =

387 5

N

+

400

    The equation is transformed into :

387 5

N

+

400

=

N

×

129

×

1 5

+

400

Right side of the equation =

N

×

129 5

+

400

    The equation is transformed into :

387 5

N

+

400

=

129 5

N

+

400

    Transposition :

387 5

N

−

129 5

N

=

400

−

400

    Combine the items on the left of the equation:

258 5

N

=

400

−

400

    Combine the items on the right of the equation:

258 5

N

=

0

    The coefficient of the unknown number is reduced to 1 :

N

=

0

÷

258 5

=

0

×

5 258

    We obtained :

N

=

0

    This is the solution of the equation.

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