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12x+17=9x-19
We move all terms to the left:
12x+17-(9x-19)=0
We get rid of parentheses
12x-9x+19+17=0
We add all the numbers together, and all the variables
3x+36=0
We move all terms containing x to the left, all other terms to the right
3x=-36
x=-36/3
x=-12
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