3g-21=6g+12

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Solution for 3g-21=6g+12 equation: 



3g-21=6g+12

We move all terms to the left:

3g-21-(6g+12)=0

We get rid of parentheses

3g-6g-12-21=0

We add all the numbers together, and all the variables

-3g-33=0

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

-3g=33

g=33/-3

g=-11

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