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x=180-x-20
We move all terms to the left:
x-(180-x-20)=0
We add all the numbers together, and all the variables
x-(-1x+160)=0
We get rid of parentheses
x+1x-160=0
We add all the numbers together, and all the variables
2x-160=0
We move all terms containing x to the left, all other terms to the right
2x=160
x=160/2
x=80
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