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12x+9=3x-6
We move all terms to the left:
12x+9-(3x-6)=0
We get rid of parentheses
12x-3x+6+9=0
We add all the numbers together, and all the variables
9x+15=0
We move all terms containing x to the left, all other terms to the right
9x=-15
x=-15/9
x=-1+2/3
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