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D( S )
S = 0
S = 0
S = 0
S in (-oo:0) U (0:+oo)
15/S = 45/117 // - 45/117
15/S-(45/117) = 0
15/S-5/13 = 0
15*S^-1 = 5/13 // : 15
S^-1 = 1/39
-1 < 0
1/(S^1) = 1/39 // * S^1
1 = 1/39*S^1 // : 1/39
39 = S^1
S = 39
S = 39
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