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12x-8=13x+7+2x
We move all terms to the left:
12x-8-(13x+7+2x)=0
We add all the numbers together, and all the variables
12x-(15x+7)-8=0
We get rid of parentheses
12x-15x-7-8=0
We add all the numbers together, and all the variables
-3x-15=0
We move all terms containing x to the left, all other terms to the right
-3x=15
x=15/-3
x=-5
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