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180=15x+3x
We move all terms to the left:
180-(15x+3x)=0
We add all the numbers together, and all the variables
-(+18x)+180=0
We get rid of parentheses
-18x+180=0
We move all terms containing x to the left, all other terms to the right
-18x=-180
x=-180/-18
x=+10
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