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180=8x+15+3x
We move all terms to the left:
180-(8x+15+3x)=0
We add all the numbers together, and all the variables
-(11x+15)+180=0
We get rid of parentheses
-11x-15+180=0
We add all the numbers together, and all the variables
-11x+165=0
We move all terms containing x to the left, all other terms to the right
-11x=-165
x=-165/-11
x=+15
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