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180=45+2x+x+15
We move all terms to the left:
180-(45+2x+x+15)=0
We add all the numbers together, and all the variables
-(3x+60)+180=0
We get rid of parentheses
-3x-60+180=0
We add all the numbers together, and all the variables
-3x+120=0
We move all terms containing x to the left, all other terms to the right
-3x=-120
x=-120/-3
x=+40
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