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x(x+3)+2(x+3)+x(x-2)-3(x-2)-2x(x+1)=0
We multiply parentheses
x^2+x^2-2x^2+3x+2x-2x-3x-2x+6+6=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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