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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5 = 6/y-3 // - 6/y-3
3-(6/y)+5 = 0
3-6*y^-1+5 = 0
-6*y^-1 = -8 // : -6
y^-1 = 4/3
-1 < 0
1/(y^1) = 4/3 // * y^1
1 = 4/3*y^1 // : 4/3
3/4 = y^1
y = 3/4
y = 3/4
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