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3x-(2x+1)=-12
We move all terms to the left:
3x-(2x+1)-(-12)=0
We add all the numbers together, and all the variables
3x-(2x+1)+12=0
We get rid of parentheses
3x-2x-1+12=0
We add all the numbers together, and all the variables
x+11=0
We move all terms containing x to the left, all other terms to the right
x=-11
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