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(2x+5)+(6x-17)+(7x-3)=180
We move all terms to the left:
(2x+5)+(6x-17)+(7x-3)-(180)=0
We get rid of parentheses
2x+6x+7x+5-17-3-180=0
We add all the numbers together, and all the variables
15x-195=0
We move all terms containing x to the left, all other terms to the right
15x=195
x=195/15
x=13
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