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15x=80+x
We move all terms to the left:
15x-(80+x)=0
We add all the numbers together, and all the variables
15x-(x+80)=0
We get rid of parentheses
15x-x-80=0
We add all the numbers together, and all the variables
14x-80=0
We move all terms containing x to the left, all other terms to the right
14x=80
x=80/14
x=5+5/7
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