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(5x+21)+(11x-65)=180
We move all terms to the left:
(5x+21)+(11x-65)-(180)=0
We get rid of parentheses
5x+11x+21-65-180=0
We add all the numbers together, and all the variables
16x-224=0
We move all terms containing x to the left, all other terms to the right
16x=224
x=224/16
x=14
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