12/20=9/s

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Solution for 12/20=9/s equation: 


D( s )

s = 0

s = 0

s = 0

s in (-oo:0) U (0:+oo)

12/20 = 9/s // - 9/s

12/20-(9/s) = 0

12/20-9*s^-1 = 0

-9*s^-1 = -3/5 // : -9

s^-1 = 1/15

-1 < 0

1/(s^1) = 1/15 // * s^1

1 = 1/15*s^1 // : 1/15

15 = s^1

s = 15

s = 15

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