21a-9=6

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Solution for 21a-9=6 equation: 



21a-9=6

We move all terms to the left:

21a-9-(6)=0

We add all the numbers together, and all the variables

21a-15=0

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

21a=15

a=15/21

a=5/7

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