-3a-9=21

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Solution for -3a-9=21 equation: 



-3a-9=21

We move all terms to the left:

-3a-9-(21)=0

We add all the numbers together, and all the variables

-3a-30=0

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

-3a=30

a=30/-3

a=-10

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