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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y-(6/y)-5 = 0
y-6*y^-1-5 = 0
1*y^1-6*y^-1-5*y^0 = 0
(1*y^2-5*y^1-6*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2-5*y^1-6*y^0) = 0
y^1
y^2-5*y-6 = 0
y^2-5*y-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
y = (49^(1/2)+5)/(1*2) or y = (5-49^(1/2))/(1*2)
y = 6 or y = -1
y in { -1, 6}
y in { -1, 6 }
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