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2x-20+x-8.5+2x=180
We move all terms to the left:
2x-20+x-8.5+2x-(180)=0
We add all the numbers together, and all the variables
5x-208.5=0
We move all terms containing x to the left, all other terms to the right
5x=208.5
x=208.5/5
x=41+2.3333333333333/3.3333333333333
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