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180=5x-10+8x+21
We move all terms to the left:
180-(5x-10+8x+21)=0
We add all the numbers together, and all the variables
-(13x+11)+180=0
We get rid of parentheses
-13x-11+180=0
We add all the numbers together, and all the variables
-13x+169=0
We move all terms containing x to the left, all other terms to the right
-13x=-169
x=-169/-13
x=+13
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