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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/2 = 18/y-5 // - 18/y-5
3/2-(18/y)+5 = 0
3/2-18*y^-1+5 = 0
-18*y^-1 = -13/2 // : -18
y^-1 = 13/36
-1 < 0
1/(y^1) = 13/36 // * y^1
1 = 13/36*y^1 // : 13/36
36/13 = y^1
y = 36/13
y = 36/13
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