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(x+2)(x-4)=(x-2)(x=1)
We move all terms to the left:
(x+2)(x-4)-((x-2)(x)=0
We multiply parentheses ..
(+x^2-4x+2x-8)-((x-2)x=0
We get rid of parentheses
x^2-4x+2x-((x-2)x-8=0
We add all the numbers together, and all the variables
x^2-2x-((x-2)x-8=0
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