A-a-a=15

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Solution for A-a-a=15 equation: 



-A-A=15

We move all terms to the left:

-A-A-(15)=0

We add all the numbers together, and all the variables

-2A-15=0

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

-2A=15

A=15/-2

A=-7+1/2

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