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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/5 = 6/y-2 // - 6/y-2
2/5-(6/y)+2 = 0
2/5-6*y^-1+2 = 0
-6*y^-1 = -12/5 // : -6
y^-1 = 2/5
-1 < 0
1/(y^1) = 2/5 // * y^1
1 = 2/5*y^1 // : 2/5
5/2 = y^1
y = 5/2
y = 5/2
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