A-12+3a=27

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Solution for A-12+3a=27 equation: 



-12+3A=27

We move all terms to the left:

-12+3A-(27)=0

We add all the numbers together, and all the variables

3A-39=0

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

3A=39

A=39/3

A=13

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