48=21+9s

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Solution for 48=21+9s equation: 



48=21+9s

We move all terms to the left:

48-(21+9s)=0

We add all the numbers together, and all the variables

-(9s+21)+48=0

We get rid of parentheses

-9s-21+48=0

We add all the numbers together, and all the variables

-9s+27=0

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

-9s=-27

s=-27/-9

s=+3

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