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(x-2)(x-6)(x+1)(x+5)=-180
We move all terms to the left:
(x-2)(x-6)(x+1)(x+5)-(-180)=0
We add all the numbers together, and all the variables
(x-2)(x-6)(x+1)(x+5)+180=0
We multiply parentheses ..
(+x^2-6x-2x+12)(x+1)(x+5)+180=0
We multiply parentheses ..
(+x^2-6x-2x+12)(+x^2+5x+x+5)+180=0
We move all terms containing x to the left, all other terms to the right
(+x^2-6x-2x+12)(+x^2+5x+x+5)=-180
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