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12x+13=2x+8+85
We move all terms to the left:
12x+13-(2x+8+85)=0
We add all the numbers together, and all the variables
12x-(2x+93)+13=0
We get rid of parentheses
12x-2x-93+13=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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