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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
15/y = -5/6 // + -5/6
15/y-(-5/6) = 0
15/y+5/6 = 0
15*y^-1 = -5/6 // : 15
y^-1 = -1/18
-1 < 0
1/(y^1) = -1/18 // * y^1
1 = -1/18*y^1 // : -1/18
-18 = y^1
y = -18
y = -18
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