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2x+13+5x+9+6x+2=180
We move all terms to the left:
2x+13+5x+9+6x+2-(180)=0
We add all the numbers together, and all the variables
13x-156=0
We move all terms containing x to the left, all other terms to the right
13x=156
x=156/13
x=12
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