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

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Solution for -30=-5a-(21+8a) equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-5a-(8a+21)), so:

-5a-(8a+21)

We get rid of parentheses

-5a-8a-21

We add all the numbers together, and all the variables

-13a-21

Back to the equation:

-(-13a-21)



We get rid of parentheses

13a+21-30=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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