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    Work: Find the solution of equation 100-x/x = 0.08 .
    Question type: Equation
    Solution:Original question:

100

−

x

÷

x

=

2 25

Multiply both sides of the equation by:

x

100

x

−

x

=

2 25

x

    Transposition :

100

x

−

x

−

2 25

x

=

0

    Combine the items on the left of the equation:

2473 25

x

=

0

    The coefficient of the unknown number is reduced to 1 :

x

=

0

÷

2473 25

=

0

×

25 2473

    We obtained :

x

=

0

    However,when simplifying the equation, multiply both sides by x , and when

x

=

0

    , its value is 0. Therefore, the value of this unknown number is not the solution of the equation, and the input to the equation is incorrect.

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