9a-6+2a=21

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



9a-6+2a=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

11a-27=0

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

11a=27

a=27/11

a=2+5/11

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