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15a-21=10a-101
We move all terms to the left:
15a-21-(10a-101)=0
We get rid of parentheses
15a-10a+101-21=0
We add all the numbers together, and all the variables
5a+80=0
We move all terms containing a to the left, all other terms to the right
5a=-80
a=-80/5
a=-16
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