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180=72+x+15
We move all terms to the left:
180-(72+x+15)=0
We add all the numbers together, and all the variables
-(x+87)+180=0
We get rid of parentheses
-x-87+180=0
We add all the numbers together, and all the variables
-1x+93=0
We move all terms containing x to the left, all other terms to the right
-x=-93
x=-93/-1
x=+93
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