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12x+9=6x+3
We move all terms to the left:
12x+9-(6x+3)=0
We get rid of parentheses
12x-6x-3+9=0
We add all the numbers together, and all the variables
6x+6=0
We move all terms containing x to the left, all other terms to the right
6x=-6
x=-6/6
x=-1
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