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    Work: Find the solution of equation 3.3/(75+x)x = 1.25 .
    Question type: Equation
    Solution:Original question:

33 10

÷

(

75

+

x

)

×

x

=

5 4

Multiply both sides of the equation by:

(

75

+

x

)

33 10

x

=

5 4

(

75

+

x

)

    Remove a bracket on the right of the equation:：

33 10

x

=

5 4

×

75

+

5 4

x

    The equation is reduced to :

33 10

x

=

375 4

+

5 4

x

    Transposition :

33 10

x

−

5 4

x

=

375 4

    Combine the items on the left of the equation:

41 20

x

=

375 4

    The coefficient of the unknown number is reduced to 1 :

x

=

375 4

÷

41 20

=

375 4

×

20 41

=

375

×

5 41

    We obtained :

x

=

1875 41

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

45.731707

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