18/15=9/s

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Solution for 18/15=9/s equation: 


D( s )

s = 0

s = 0

s = 0

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

18/15 = 9/s // - 9/s

18/15-(9/s) = 0

18/15-9*s^-1 = 0

-9*s^-1 = -6/5 // : -9

s^-1 = 2/15

-1 < 0

1/(s^1) = 2/15 // * s^1

1 = 2/15*s^1 // : 2/15

15/2 = s^1

s = 15/2

s = 15/2

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