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    Work: Find the solution of equation 3.3/(75+25)*25 = x .
    Question type: Equation
    Solution:Original question:

33 10

÷

(

75

+

25

)

×

25

=

x

Multiply both sides of the equation by:

(

75

+

25

)

33 10

×

25

=

x

(

75

+

25

)

    Remove a bracket on the right of the equation:：

33 10

×

25

=

x

×

75

+

x

×

25

    The equation is reduced to :

165 2

=

x

×

75

+

x

×

25

    The equation is reduced to :

165 2

=

100

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 :

100

x

=

165 2

    The coefficient of the unknown number is reduced to 1 :

x

=

165 2

÷

100

=

165 2

×

1 100

=

33 2

×

1 20

    We obtained :

x

=

33 40

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

0.825

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