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180=3x-42-18
We move all terms to the left:
180-(3x-42-18)=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+240=0
We move all terms containing x to the left, all other terms to the right
-3x=-240
x=-240/-3
x=+80
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