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(x-1)(x+7)=(x
We move all terms to the left:
(x-1)(x+7)-((x)=0
We multiply parentheses ..
(+x^2+7x-1x-7)-(x=0
We get rid of parentheses
x^2+7x-1x-(x-7=0
We add all the numbers together, and all the variables
x^2+6x-(x-7=0
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