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(11x+5)+(9x-15)=180
We move all terms to the left:
(11x+5)+(9x-15)-(180)=0
We get rid of parentheses
11x+9x+5-15-180=0
We add all the numbers together, and all the variables
20x-190=0
We move all terms containing x to the left, all other terms to the right
20x=190
x=190/20
x=9+1/2
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