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12x-9=x-3
We move all terms to the left:
12x-9-(x-3)=0
We get rid of parentheses
12x-x+3-9=0
We add all the numbers together, and all the variables
11x-6=0
We move all terms containing x to the left, all other terms to the right
11x=6
x=6/11
x=6/11
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