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9+12x=10x+3
We move all terms to the left:
9+12x-(10x+3)=0
We get rid of parentheses
12x-10x-3+9=0
We add all the numbers together, and all the variables
2x+6=0
We move all terms containing x to the left, all other terms to the right
2x=-6
x=-6/2
x=-3
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