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180=90-25-x
We move all terms to the left:
180-(90-25-x)=0
We add all the numbers together, and all the variables
-(-1x+65)+180=0
We get rid of parentheses
1x-65+180=0
We add all the numbers together, and all the variables
x+115=0
We move all terms containing x to the left, all other terms to the right
x=-115
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