9+3g=21

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Solution for 9+3g=21 equation: 



9+3g=21

We move all terms to the left:

9+3g-(21)=0

We add all the numbers together, and all the variables

3g-12=0

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

3g=12

g=12/3

g=4

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