21=6+g

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Solution for 21=6+g equation: 



21=6+g

We move all terms to the left:

21-(6+g)=0

We add all the numbers together, and all the variables

-(g+6)+21=0

We get rid of parentheses

-g-6+21=0

We add all the numbers together, and all the variables

-1g+15=0

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

-g=-15

g=-15/-1

g=+15

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