2g+12=3g+21

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Solution for 2g+12=3g+21 equation: 



2g+12=3g+21

We move all terms to the left:

2g+12-(3g+21)=0

We get rid of parentheses

2g-3g-21+12=0

We add all the numbers together, and all the variables

-1g-9=0

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

-g=9

g=9/-1

g=-9

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