4a+9=21-2a

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Solution for 4a+9=21-2a equation: 



4a+9=21-2a

We move all terms to the left:

4a+9-(21-2a)=0

We add all the numbers together, and all the variables

4a-(-2a+21)+9=0

We get rid of parentheses

4a+2a-21+9=0

We add all the numbers together, and all the variables

6a-12=0

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

6a=12

a=12/6

a=2

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