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(5x-10)+(2x+65)+(x+45)=180
We move all terms to the left:
(5x-10)+(2x+65)+(x+45)-(180)=0
We get rid of parentheses
5x+2x+x-10+65+45-180=0
We add all the numbers together, and all the variables
8x-80=0
We move all terms containing x to the left, all other terms to the right
8x=80
x=80/8
x=10
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