12g+21=15g

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Solution for 12g+21=15g equation: 



12g+21=15g

We move all terms to the left:

12g+21-(15g)=0

We add all the numbers together, and all the variables

-3g+21=0

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

-3g=-21

g=-21/-3

g=+7

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