28/s=4

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Solution for 28/s=4 equation: 


D( s )

s = 0

s = 0

s = 0

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

28/s = 4 // - 4

28/s-4 = 0

28*s^-1 = 4 // : 28

s^-1 = 1/7

-1 < 0

1/(s^1) = 1/7 // * s^1

1 = 1/7*s^1 // : 1/7

7 = s^1

s = 7

s = 7

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