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3x+12+3x+15+8x+17=180
We move all terms to the left:
3x+12+3x+15+8x+17-(180)=0
We add all the numbers together, and all the variables
14x-136=0
We move all terms containing x to the left, all other terms to the right
14x=136
x=136/14
x=9+5/7
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