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5x-15+2x+42+2x+42=180
We move all terms to the left:
5x-15+2x+42+2x+42-(180)=0
We add all the numbers together, and all the variables
9x-111=0
We move all terms containing x to the left, all other terms to the right
9x=111
x=111/9
x=12+1/3
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