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x^2+4x+3x+12=x^2+2x+x+2
We move all terms to the left:
x^2+4x+3x+12-(x^2+2x+x+2)=0
We add all the numbers together, and all the variables
x^2+7x-(x^2+2x+x+2)+12=0
We get rid of parentheses
x^2-x^2+7x-2x-x-2+12=0
We add all the numbers together, and all the variables
4x+10=0
We move all terms containing x to the left, all other terms to the right
4x=-10
x=-10/4
x=-2+1/2
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