21=6-a-4a

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Solution for 21=6-a-4a equation: 



21=6-a-4a

We move all terms to the left:

21-(6-a-4a)=0

We add all the numbers together, and all the variables

-(-5a+6)+21=0

We get rid of parentheses

5a-6+21=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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