A-3=12+4a

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Solution for A-3=12+4a equation: 



-3=12+4A

We move all terms to the left:

-3-(12+4A)=0

We add all the numbers together, and all the variables

-(4A+12)-3=0

We get rid of parentheses

-4A-12-3=0

We add all the numbers together, and all the variables

-4A-15=0

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

-4A=15

A=15/-4

A=-3+3/4

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