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(x+1)(x+2)-x/2=11
We move all terms to the left:
(x+1)(x+2)-x/2-(11)=0
We multiply parentheses ..
(+x^2+2x+x+2)-x/2-11=0
We multiply all the terms by the denominator
((+x^2+2x+x+2))*2-x-11*2=0
We add all the numbers together, and all the variables
((+x^2+2x+x+2))*2-1x-22=0
We move all terms containing x to the left, all other terms to the right
((+x^2+2x+x+2))*2-1x=22
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