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    Work: Find the solution of equation 18(X-8)-15X = 120 .
    Question type: Equation
    Solution:Original question:

18

(

X

−

8

)

−

15

X

=

120

    Remove the bracket on the left of the equation:

Left side of the equation =

18

X

−

18

×

8

−

15

X

=

18

X

−

144

−

15

X

=

3

X

−

144

    The equation is transformed into :

3

X

−

144

=

120

    Transposition :

3

X

=

120

+

144

    Combine the items on the right of the equation:

3

X

=

264

    The coefficient of the unknown number is reduced to 1 :

X

=

264

÷

3

=

264

×

1 3

=

88

×

1

    We obtained :

X

=

88

    This is the solution of the equation.

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