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6x+30+5x+12+2x+8=180
We move all terms to the left:
6x+30+5x+12+2x+8-(180)=0
We add all the numbers together, and all the variables
13x-130=0
We move all terms containing x to the left, all other terms to the right
13x=130
x=130/13
x=10
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