21-2g=1

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Solution for 21-2g=1 equation: 



21-2g=1

We move all terms to the left:

21-2g-(1)=0

We add all the numbers together, and all the variables

-2g+20=0

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

-2g=-20

g=-20/-2

g=+10

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