8a-9=21

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Solution for 8a-9=21 equation: 



8a-9=21

We move all terms to the left:

8a-9-(21)=0

We add all the numbers together, and all the variables

8a-30=0

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

8a=30

a=30/8

a=3+3/4

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