-12=4s-s

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Solution for -12=4s-s equation: 



-12=4s-s

We move all terms to the left:

-12-(4s-s)=0

We add all the numbers together, and all the variables

-(+3s)-12=0

We get rid of parentheses

-3s-12=0

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

-3s=12

s=12/-3

s=-4

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