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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