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15a-80=4a-14
We move all terms to the left:
15a-80-(4a-14)=0
We get rid of parentheses
15a-4a+14-80=0
We add all the numbers together, and all the variables
11a-66=0
We move all terms containing a to the left, all other terms to the right
11a=66
a=66/11
a=6
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