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12x-13=-6x-17
We move all terms to the left:
12x-13-(-6x-17)=0
We get rid of parentheses
12x+6x+17-13=0
We add all the numbers together, and all the variables
18x+4=0
We move all terms containing x to the left, all other terms to the right
18x=-4
x=-4/18
x=-2/9
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