7/s-4=21/s+18

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Solution for 7/s-4=21/s+18 equation: 


D( s )

s = 0

s = 0

s = 0

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

7/s-4 = 21/s+18 // - 21/s+18

7/s-(21/s)-18-4 = 0

7/s-21*s^-1-18-4 = 0

-14*s^-1 = 22 // : -14

s^-1 = -11/7

-1 < 0

1/(s^1) = -11/7 // * s^1

1 = -11/7*s^1 // : -11/7

-7/11 = s^1

s = -7/11

s = -7/11

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