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x+13+12x+13+2x-2=180
We move all terms to the left:
x+13+12x+13+2x-2-(180)=0
We add all the numbers together, and all the variables
15x-156=0
We move all terms containing x to the left, all other terms to the right
15x=156
x=156/15
x=10+2/5
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