A15n=-3n+12

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Solution for A15n=-3n+12 equation: 



15A=-3A+12

We move all terms to the left:

15A-(-3A+12)=0

We get rid of parentheses

15A+3A-12=0

We add all the numbers together, and all the variables

18A-12=0

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

18A=12

A=12/18

A=2/3

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