15a-21=10a-101

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Solution for 15a-21=10a-101 equation: 



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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