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3x-12=5x+9
We move all terms to the left:
3x-12-(5x+9)=0
We get rid of parentheses
3x-5x-9-12=0
We add all the numbers together, and all the variables
-2x-21=0
We move all terms containing x to the left, all other terms to the right
-2x=21
x=21/-2
x=-10+1/2
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