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180=90+45+x
We move all terms to the left:
180-(90+45+x)=0
We add all the numbers together, and all the variables
-(x+135)+180=0
We get rid of parentheses
-x-135+180=0
We add all the numbers together, and all the variables
-1x+45=0
We move all terms containing x to the left, all other terms to the right
-x=-45
x=-45/-1
x=+45
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