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(x+2)(x+3)(x+10)(x+11)=180
We move all terms to the left:
(x+2)(x+3)(x+10)(x+11)-(180)=0
We multiply parentheses ..
(+x^2+3x+2x+6)(x+10)(x+11)-180=0
We multiply parentheses ..
(+x^2+3x+2x+6)(+x^2+11x+10x+110)-180=0
We move all terms containing x to the left, all other terms to the right
(+x^2+3x+2x+6)(+x^2+11x+10x+110)=180
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