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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+6/y-4+1 = y+1/y-1 // - y+1/y-1
y-y+6/y-(1/y)-4+1+1 = 0
y-y+6/y-y^-1-4+1+1 = 0
5*y^-1 = 2 // : 5
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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