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    Work: Find the solution of equation （30-x)+x+（25-x） = 0 .
    Question type: Equation
    Solution:Original question:

(

30

−

x

)

+

x

+

(

25

−

x

)

=

0

    Remove the bracket on the left of the equation:

Left side of the equation =

30

−

x

+

x

+

(

25

−

x

)

=

30

−

0

x

+

(

25

−

x

)

=

30

−

0

x

+

25

−

x

=

55

−

1

x

    The equation is transformed into :

55

−

1

x

=

0

    Transposition :

-

1

x

=

0

−

55

    i.e.

-

x

=

0

−

55

    Combine the items on the right of the equation:

-

x

=

-

55

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

55

=

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 :

x

=

55

    This is the solution of the equation.
    This is the solution of the equation.

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