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180=54+3x
We move all terms to the left:
180-(54+3x)=0
We add all the numbers together, and all the variables
-(3x+54)+180=0
We get rid of parentheses
-3x-54+180=0
We add all the numbers together, and all the variables
-3x+126=0
We move all terms containing x to the left, all other terms to the right
-3x=-126
x=-126/-3
x=+42
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