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(7x+15)+x+(2x-10)=180
We move all terms to the left:
(7x+15)+x+(2x-10)-(180)=0
We add all the numbers together, and all the variables
x+(7x+15)+(2x-10)-180=0
We get rid of parentheses
x+7x+2x+15-10-180=0
We add all the numbers together, and all the variables
10x-175=0
We move all terms containing x to the left, all other terms to the right
10x=175
x=175/10
x=17+1/2
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