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