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