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(2x)+(2x-20)+(x-8.5)=180
We move all terms to the left:
(2x)+(2x-20)+(x-8.5)-(180)=0
We get rid of parentheses
2x+2x+x-20-8.5-180=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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