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12x-6=13x-15
We move all terms to the left:
12x-6-(13x-15)=0
We get rid of parentheses
12x-13x+15-6=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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