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180=8x+20
We move all terms to the left:
180-(8x+20)=0
We get rid of parentheses
-8x-20+180=0
We add all the numbers together, and all the variables
-8x+160=0
We move all terms containing x to the left, all other terms to the right
-8x=-160
x=-160/-8
x=+20
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