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180=4x+8x
We move all terms to the left:
180-(4x+8x)=0
We add all the numbers together, and all the variables
-(+12x)+180=0
We get rid of parentheses
-12x+180=0
We move all terms containing x to the left, all other terms to the right
-12x=-180
x=-180/-12
x=+15
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