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180=81+84+x
We move all terms to the left:
180-(81+84+x)=0
We add all the numbers together, and all the variables
-(x+165)+180=0
We get rid of parentheses
-x-165+180=0
We add all the numbers together, and all the variables
-1x+15=0
We move all terms containing x to the left, all other terms to the right
-x=-15
x=-15/-1
x=+15
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