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(10x-10)+(5x+10)=180
We move all terms to the left:
(10x-10)+(5x+10)-(180)=0
We get rid of parentheses
10x+5x-10+10-180=0
We add all the numbers together, and all the variables
15x-180=0
We move all terms containing x to the left, all other terms to the right
15x=180
x=180/15
x=12
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