-40/s=4

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Solution for -40/s=4 equation: 


D( s )

s = 0

s = 0

s = 0

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

-40/s = 4 // - 4

-40/s-4 = 0

-40*s^-1 = 4 // : -40

s^-1 = -1/10

-1 < 0

1/(s^1) = -1/10 // * s^1

1 = -1/10*s^1 // : -1/10

-10 = s^1

s = -10

s = -10

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