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    Work: Find the solution of equation 6x+240−8x = 220 .
    Question type: Equation
    Solution:Original question:

6

x

+

240

−

8

x

=

220

Left side of the equation =

-

2

x

+

240

    The equation is transformed into :

-

2

x

+

240

=

220

    Transposition :

-

2

x

=

220

−

240

    Combine the items on the right of the equation:

-

2

x

=

-

20

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

20

=

2

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 :

2

x

=

20

    The coefficient of the unknown number is reduced to 1 :

x

=

20

÷

2

=

20

×

1 2

=

10

×

1

    We obtained :

x

=

10

    This is the solution of the equation.

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