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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
36/s = 9/8 // - 9/8
36/s-(9/8) = 0
36/s-9/8 = 0
36*s^-1 = 9/8 // : 36
s^-1 = 1/32
-1 < 0
1/(s^1) = 1/32 // * s^1
1 = 1/32*s^1 // : 1/32
32 = s^1
s = 32
s = 32
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