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12+2x=11+-2x
We move all terms to the left:
12+2x-(11+-2x)=0
We add all the numbers together, and all the variables
2x-(-2x)+12=0
We get rid of parentheses
2x+2x+12=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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