(x-30)[500-10(x-40)]=8000

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(x-30)[500-10(x-40)]=8000

(x-30)[500-10(x-40)]=8000
(x-30)[500-10(x-40)]=8000

(x-30)[500-10(x-40)]=8000
(x-30)[500-10(x-40)]=8000
(x-30)(50-x+40)= 800
-(x-30)(x-90)= 800
x² - 120x + 2700 = -800
x² - 120x + 3500 = 0
(x-50)(x-70)= 0
x= 50 或 x= 70