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3x-(2x+3)=2x+9
We move all terms to the left:
3x-(2x+3)-(2x+9)=0
We get rid of parentheses
3x-2x-2x-3-9=0
We add all the numbers together, and all the variables
-1x-12=0
We move all terms containing x to the left, all other terms to the right
-x=12
x=12/-1
x=-12
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