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180=126-x+54-x
We move all terms to the left:
180-(126-x+54-x)=0
We add all the numbers together, and all the variables
-(-2x+180)+180=0
We get rid of parentheses
2x-180+180=0
We add all the numbers together, and all the variables
2x=0
x=0/2
x=0
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