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x+3-12=2x+15
We move all terms to the left:
x+3-12-(2x+15)=0
We add all the numbers together, and all the variables
x-(2x+15)-9=0
We get rid of parentheses
x-2x-15-9=0
We add all the numbers together, and all the variables
-1x-24=0
We move all terms containing x to the left, all other terms to the right
-x=24
x=24/-1
x=-24
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