(X-80)(X-20)=80(X+20)

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(X-80)(X-20)=80(X+20)
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(X-80)(X-20)=80(X+20)
(X-80)(X-20)=80(X+20)

(X-80)(X-20)=80(X+20)
x^2-100x+1600-80x-1600=0
x^2-180x=0
x(x-180)=0
x=0
x=180

xx-100x+1600=80x+1600
xx-180x=0
x(x-180)=0
x=0或x-180=0
x=0或x=180

x^2-20x-80x+1600=80x+1600
x^2-180x=0
x(x-180)=0
x=0或x=180