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