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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
15/y = 1 // - 1
15/y-1 = 0
15*y^-1 = 1 // : 15
y^-1 = 1/15
-1 < 0
1/(y^1) = 1/15 // * y^1
1 = 1/15*y^1 // : 1/15
15 = y^1
y = 15
y = 15
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