-21=9-2a

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Solution for -21=9-2a equation: 



-21=9-2a

We move all terms to the left:

-21-(9-2a)=0

We add all the numbers together, and all the variables

-(-2a+9)-21=0

We get rid of parentheses

2a-9-21=0

We add all the numbers together, and all the variables

2a-30=0

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

2a=30

a=30/2

a=15

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