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180=(15x)+90+45
We move all terms to the left:
180-((15x)+90+45)=0
We add all the numbers together, and all the variables
-(15x+135)+180=0
We get rid of parentheses
-15x-135+180=0
We add all the numbers together, and all the variables
-15x+45=0
We move all terms containing x to the left, all other terms to the right
-15x=-45
x=-45/-15
x=+3
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