9+6a-2a=-21

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Solution for 9+6a-2a=-21 equation: 



9+6a-2a=-21

We move all terms to the left:

9+6a-2a-(-21)=0

We add all the numbers together, and all the variables

4a+30=0

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

4a=-30

a=-30/4

a=-7+1/2

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