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12x-9=3x+9
We move all terms to the left:
12x-9-(3x+9)=0
We get rid of parentheses
12x-3x-9-9=0
We add all the numbers together, and all the variables
9x-18=0
We move all terms containing x to the left, all other terms to the right
9x=18
x=18/9
x=2
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