-21=27-4a

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Solution for -21=27-4a equation: 



-21=27-4a

We move all terms to the left:

-21-(27-4a)=0

We add all the numbers together, and all the variables

-(-4a+27)-21=0

We get rid of parentheses

4a-27-21=0

We add all the numbers together, and all the variables

4a-48=0

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

4a=48

a=48/4

a=12

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