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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y+1/6-5 = (-6/2)*y-10 // - (-6/2)*y-10
1/y-((-6/2)*y)+1/6-5+10 = 0
3*y+1/y+1/6-5+10 = 0
3*y^1+1*y^-1+31/6*y^0 = 0
(3*y^2+31/6*y^1+1*y^0)/(y^1) = 0 // * y^2
y^1*(3*y^2+31/6*y^1+1*y^0) = 0
y^1
3*y^2+(31/6)*y+1 = 0
3*y^2+(31/6)*y+1 = 0
DELTA = (31/6)^2-(1*3*4)
DELTA = 529/36
DELTA > 0
y = ((529/36)^(1/2)-(31/6))/(2*3) or y = (-(31/6)-(529/36)^(1/2))/(2*3)
y = -2/9 or y = -3/2
y in { -3/2, -2/9}
y in { -3/2, -2/9 }
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