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D( s )
-9*s = 0
-9*s = 0
-9*s = 0
-9*s = 0 // : -9
s = 0
s in (-oo:0) U (0:+oo)
(1*((9*s)/(-1)))/(-9*s) = 0
(-9*1*s)/(-9*s) = 0
1 = 0
s belongs to the empty set
s belongs to the empty set
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