2-g+9+12=21

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Solution for 2-g+9+12=21 equation: 



2-g+9+12=21

We move all terms to the left:

2-g+9+12-(21)=0

We add all the numbers together, and all the variables

-1g+2=0

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

-g=-2

g=-2/-1

g=+2

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