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-9+3x=10x+12
We move all terms to the left:
-9+3x-(10x+12)=0
We get rid of parentheses
3x-10x-12-9=0
We add all the numbers together, and all the variables
-7x-21=0
We move all terms containing x to the left, all other terms to the right
-7x=21
x=21/-7
x=-3
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