-21-8a=5a-30

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Solution for -21-8a=5a-30 equation: 



-21-8a=5a-30

We move all terms to the left:

-21-8a-(5a-30)=0

We get rid of parentheses

-8a-5a+30-21=0

We add all the numbers together, and all the variables

-13a+9=0

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

-13a=-9

a=-9/-13

a=9/13

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