-21a+28a-6=20

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Solution for -21a+28a-6=20 equation: 



-21a+28a-6=20

We move all terms to the left:

-21a+28a-6-(20)=0

We add all the numbers together, and all the variables

7a-26=0

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

7a=26

a=26/7

a=3+5/7

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