9a-15=84

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Solution for 9a-15=84 equation: 



9a-15=84

We move all terms to the left:

9a-15-(84)=0

We add all the numbers together, and all the variables

9a-99=0

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

9a=99

a=99/9

a=11

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