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9a+80=15-6a
We move all terms to the left:
9a+80-(15-6a)=0
We add all the numbers together, and all the variables
9a-(-6a+15)+80=0
We get rid of parentheses
9a+6a-15+80=0
We add all the numbers together, and all the variables
15a+65=0
We move all terms containing a to the left, all other terms to the right
15a=-65
a=-65/15
a=-4+1/3
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