21=28-g

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Solution for 21=28-g equation: 



21=28-g

We move all terms to the left:

21-(28-g)=0

We add all the numbers together, and all the variables

-(-1g+28)+21=0

We get rid of parentheses

1g-28+21=0

We add all the numbers together, and all the variables

g-7=0

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

g=7

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