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180=80+x+30
We move all terms to the left:
180-(80+x+30)=0
We add all the numbers together, and all the variables
-(x+110)+180=0
We get rid of parentheses
-x-110+180=0
We add all the numbers together, and all the variables
-1x+70=0
We move all terms containing x to the left, all other terms to the right
-x=-70
x=-70/-1
x=+70
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