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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+7/y-(6/8)-8 = 0
y+7/y-3/4-8 = 0
1*y^1+7*y^-1-35/4*y^0 = 0
(1*y^2-35/4*y^1+7*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2-35/4*y^1+7*y^0) = 0
y^1
y^2+(-35/4)*y+7 = 0
y^2+(-35/4)*y+7 = 0
DELTA = (-35/4)^2-(1*4*7)
DELTA = 777/16
DELTA > 0
y = ((777/16)^(1/2)-(-35/4))/(1*2) or y = (-(-35/4)-(777/16)^(1/2))/(1*2)
y = ((777/16)^(1/2)+35/4)/2 or y = (35/4-(777/16)^(1/2))/2
y in { (35/4-(777/16)^(1/2))/2, ((777/16)^(1/2)+35/4)/2}
y in { (35/4-(777/16)^(1/2))/2, ((777/16)^(1/2)+35/4)/2 }
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