21=7-4a

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Solution for 21=7-4a equation: 



21=7-4a

We move all terms to the left:

21-(7-4a)=0

We add all the numbers together, and all the variables

-(-4a+7)+21=0

We get rid of parentheses

4a-7+21=0

We add all the numbers together, and all the variables

4a+14=0

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

4a=-14

a=-14/4

a=-3+1/2

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