-3s+18=21

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Solution for -3s+18=21 equation: 



-3s+18=21

We move all terms to the left:

-3s+18-(21)=0

We add all the numbers together, and all the variables

-3s-3=0

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

-3s=3

s=3/-3

s=-1

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