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    Work: Find the solution of equation N*129*0.2+500000 = N*129*0.8-500000 .
    Question type: Equation
    Solution:Original question:

N

×

129

×

1 5

+

500000

=

N

×

129

×

4 5

−

500000

Left side of the equation =

N

×

129 5

+

500000

    The equation is transformed into :

129 5

N

+

500000

=

N

×

129

×

4 5

−

500000

Right side of the equation =

N

×

516 5

−

500000

    The equation is transformed into :

129 5

N

+

500000

=

516 5

N

−

500000

    Transposition :

129 5

N

−

516 5

N

=

-

500000

−

500000

    Combine the items on the left of the equation:

-

387 5

N

=

-

500000

−

500000

    Combine the items on the right of the equation:

-

387 5

N

=

-

1000000

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

1000000

=

387 5

N

    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 :

387 5

N

=

1000000

    The coefficient of the unknown number is reduced to 1 :

N

=

1000000

÷

387 5

=

1000000

×

5 387

    We obtained :

N

=

5000000 387

    This is the solution of the equation.

    Convert the result to decimal form :

N

=

12919.896641

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