-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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