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    Work: Find the solution of equation (x-387)÷x = 400÷1000 .
    Question type: Equation
    Solution:Original question:

(

x

−

387

)

÷

x

=

400

÷

1000

Multiply both sides of the equation by:

x

(

x

−

387

)

=

400

÷

1000

×

x

    Remove a bracket on the left of the equation:：

x

−

387

=

400

÷

1000

×

x

    The equation is reduced to :

x

−

387

=

2 5

x

    Transposition :

x

−

2 5

x

=

387

    Combine the items on the left of the equation:

3 5

x

=

387

    The coefficient of the unknown number is reduced to 1 :

x

=

387

÷

3 5

=

387

×

5 3

=

129

×

5

    We obtained :

x

=

645

    This is the solution of the equation.

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