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    Work: Find the solution of equation x＋（1＋0.4）x = 84 .
    Question type: Equation
    Solution:Original question:

x

+

(

1

+

2 5

)

x

=

84

    Remove the bracket on the left of the equation:

Left side of the equation =

x

+

1

x

+

2 5

x

=

12 5

x

    The equation is transformed into :

12 5

x

=

84

    The coefficient of the unknown number is reduced to 1 :

x

=

84

÷

12 5

=

84

×

5 12

=

7

×

5

    We obtained :

x

=

35

    This is the solution of the equation.

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