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(10x-40)+(5x+20)=180
We move all terms to the left:
(10x-40)+(5x+20)-(180)=0
We get rid of parentheses
10x+5x-40+20-180=0
We add all the numbers together, and all the variables
15x-200=0
We move all terms containing x to the left, all other terms to the right
15x=200
x=200/15
x=13+1/3
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