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    Work: Find the solution of equation 0.8X = X-70 .
    Question type: Equation
    Solution:Original question:

4 5

X

=

X

−

70

    Transposition :

4 5

X

−

X

=

-

70

    Combine the items on the left of the equation:

-

1 5

X

=

-

70

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

70

=

1 5

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 :

1 5

X

=

70

    The coefficient of the unknown number is reduced to 1 :

X

=

70

÷

1 5

=

70

×

5

    We obtained :

X

=

350

    This is the solution of the equation.

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