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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/3 = 5/y-3 // - 5/y-3
1/3-(5/y)+3 = 0
1/3-5*y^-1+3 = 0
-5*y^-1 = -10/3 // : -5
y^-1 = 2/3
-1 < 0
1/(y^1) = 2/3 // * y^1
1 = 2/3*y^1 // : 2/3
3/2 = y^1
y = 3/2
y = 3/2
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