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    Work: Find the solution of equation 3.3/(75+x)x = 1.28 .
    Question type: Equation
    Solution:Original question:

33 10

÷

(

75

+

x

)

×

x

=

32 25

Multiply both sides of the equation by:

(

75

+

x

)

33 10

x

=

32 25

(

75

+

x

)

    Remove a bracket on the right of the equation:：

33 10

x

=

32 25

×

75

+

32 25

x

    The equation is reduced to :

33 10

x

=

96

+

32 25

x

    Transposition :

33 10

x

−

32 25

x

=

96

    Combine the items on the left of the equation:

101 50

x

=

96

    The coefficient of the unknown number is reduced to 1 :

x

=

96

÷

101 50

=

96

×

50 101

    We obtained :

x

=

4800 101

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

47.524752

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