13-9a=21-7a

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Solution for 13-9a=21-7a equation: 



13-9a=21-7a

We move all terms to the left:

13-9a-(21-7a)=0

We add all the numbers together, and all the variables

-9a-(-7a+21)+13=0

We get rid of parentheses

-9a+7a-21+13=0

We add all the numbers together, and all the variables

-2a-8=0

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

-2a=8

a=8/-2

a=-4

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