9=21-4g

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Solution for 9=21-4g equation: 



9=21-4g

We move all terms to the left:

9-(21-4g)=0

We add all the numbers together, and all the variables

-(-4g+21)+9=0

We get rid of parentheses

4g-21+9=0

We add all the numbers together, and all the variables

4g-12=0

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

4g=12

g=12/4

g=3

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