-27=21-s

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Solution for -27=21-s equation: 



-27=21-s

We move all terms to the left:

-27-(21-s)=0

We add all the numbers together, and all the variables

-(-1s+21)-27=0

We get rid of parentheses

1s-21-27=0

We add all the numbers together, and all the variables

s-48=0

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

s=48

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