-21a+28a-6=15

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Solution for -21a+28a-6=15 equation: 



-21a+28a-6=15

We move all terms to the left:

-21a+28a-6-(15)=0

We add all the numbers together, and all the variables

7a-21=0

We move all terms containing a to the left, all other terms to the right

7a=21

a=21/7

a=3

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