A+a+3a+7A=12a

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Solution for A+a+3a+7A=12a equation: 



+A+3A+7=12A

We move all terms to the left:

+A+3A+7-(12A)=0

We add all the numbers together, and all the variables

-8A+7=0

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

-8A=-7

A=-7/-8

A=7/8

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