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12x+17=6x+9
We move all terms to the left:
12x+17-(6x+9)=0
We get rid of parentheses
12x-6x-9+17=0
We add all the numbers together, and all the variables
6x+8=0
We move all terms containing x to the left, all other terms to the right
6x=-8
x=-8/6
x=-1+1/3
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