3g=9+21

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Solution for 3g=9+21 equation: 



3g=9+21

We move all terms to the left:

3g-(9+21)=0

We add all the numbers together, and all the variables

3g-30=0

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

3g=30

g=30/3

g=10

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