-21-9=6a+15

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Solution for -21-9=6a+15 equation: 



-21-9=6a+15

We move all terms to the left:

-21-9-(6a+15)=0

We add all the numbers together, and all the variables

-(6a+15)-30=0

We get rid of parentheses

-6a-15-30=0

We add all the numbers together, and all the variables

-6a-45=0

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

-6a=45

a=45/-6

a=-7+1/2

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