-4a+9=21

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Solution for -4a+9=21 equation: 



-4a+9=21

We move all terms to the left:

-4a+9-(21)=0

We add all the numbers together, and all the variables

-4a-12=0

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

-4a=12

a=12/-4

a=-3

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