g(-7)=-21

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Solution for g(-7)=-21 equation: 



g(-7)=-21

We move all terms to the left:

g(-7)-(-21)=0

We add all the numbers together, and all the variables

g(-7)+21=0

We multiply parentheses

-7g+21=0

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

-7g=-21

g=-21/-7

g=+3

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