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[ 1/1 Equation]
    Work: Find the solution of equation x+2/5x = 21 .
    Question type: Equation
    Solution:Original question:

x

+

2

÷

5

×

x

=

21

Left side of the equation =

x

+

2 5

x

=

7 5

x

    The equation is transformed into :

7 5

x

=

21

    The coefficient of the unknown number is reduced to 1 :

x

=

21

÷

7 5

=

21

×

5 7

=

3

×

5

    We obtained :

x

=

15

    This is the solution of the equation.

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