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    Work: Find the solution of equation x+2x = 84 .
    Question type: Equation
    Solution:Original question:

x

+

2

x

=

84

Left side of the equation =

3

x

    The equation is transformed into :

3

x

=

84

    The coefficient of the unknown number is reduced to 1 :

x

=

84

÷

3

=

84

×

1 3

=

28

×

1

    We obtained :

x

=

28

    This is the solution of the equation.

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