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