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(15x+5)+(6x+6)=80
We move all terms to the left:
(15x+5)+(6x+6)-(80)=0
We get rid of parentheses
15x+6x+5+6-80=0
We add all the numbers together, and all the variables
21x-69=0
We move all terms containing x to the left, all other terms to the right
21x=69
x=69/21
x=3+2/7
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