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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
36/90 = 48/s // - 48/s
36/90-(48/s) = 0
36/90-48*s^-1 = 0
-48*s^-1 = -2/5 // : -48
s^-1 = 1/120
-1 < 0
1/(s^1) = 1/120 // * s^1
1 = 1/120*s^1 // : 1/120
120 = s^1
s = 120
s = 120
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