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180=8x+5x
We move all terms to the left:
180-(8x+5x)=0
We add all the numbers together, and all the variables
-(+13x)+180=0
We get rid of parentheses
-13x+180=0
We move all terms containing x to the left, all other terms to the right
-13x=-180
x=-180/-13
x=13+11/13
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