-21=-6-6a

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Solution for -21=-6-6a equation: 



-21=-6-6a

We move all terms to the left:

-21-(-6-6a)=0

We add all the numbers together, and all the variables

-(-6a-6)-21=0

We get rid of parentheses

6a+6-21=0

We add all the numbers together, and all the variables

6a-15=0

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

6a=15

a=15/6

a=2+1/2

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