-13=g-21

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Solution for -13=g-21 equation: 



-13=g-21

We move all terms to the left:

-13-(g-21)=0

We get rid of parentheses

-g+21-13=0

We add all the numbers together, and all the variables

-1g+8=0

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

-g=-8

g=-8/-1

g=+8

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