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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