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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/5 = 3/y-3 // - 3/y-3
2/5-(3/y)+3 = 0
2/5-3*y^-1+3 = 0
-3*y^-1 = -17/5 // : -3
y^-1 = 17/15
-1 < 0
1/(y^1) = 17/15 // * y^1
1 = 17/15*y^1 // : 17/15
15/17 = y^1
y = 15/17
y = 15/17
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