2g+21=5g-9

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Solution for 2g+21=5g-9 equation: 



2g+21=5g-9

We move all terms to the left:

2g+21-(5g-9)=0

We get rid of parentheses

2g-5g+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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