9+16a=21

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Solution for 9+16a=21 equation: 



9+16a=21

We move all terms to the left:

9+16a-(21)=0

We add all the numbers together, and all the variables

16a-12=0

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

16a=12

a=12/16

a=3/4

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