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    Work: Find the solution of equation （x+20）（300-x） = 8700 .
    Question type: Equation
    Solution:Original question:

(

x

+

20

)

(

300

−

x

)

=

8700

    Remove the bracket on the left of the equation:

Left side of the equation =

x

(

300

−

x

)

+

20

(

300

−

x

)

=

x

×

300

−

x

x

+

20

(

300

−

x

)

=

300

x

−

x

x

+

20

×

300

−

20

x

=

300

x

−

x

x

+

6000

−

20

x

=

280

x

−

x

x

+

6000

    The equation is transformed into :

280

x

−

x

x

+

6000

=

8700

    
        x=10    
    There are 1 solution(s).

解一元一次方程的详细方法请参阅：《一元一次方程的解法》

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