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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+7/x+9 = 5/6 // - 5/6
x+7/x-(5/6)+9 = 0
x+7/x-5/6+9 = 0
1*x^1+7*x^-1+49/6*x^0 = 0
(1*x^2+49/6*x^1+7*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+49/6*x^1+7*x^0) = 0
x^1
x^2+(49/6)*x+7 = 0
x^2+(49/6)*x+7 = 0
DELTA = (49/6)^2-(1*4*7)
DELTA = 1393/36
DELTA > 0
x = ((1393/36)^(1/2)-(49/6))/(1*2) or x = (-(49/6)-(1393/36)^(1/2))/(1*2)
x = ((1393/36)^(1/2)-49/6)/2 or x = (-((1393/36)^(1/2)+49/6))/2
x in { (-((1393/36)^(1/2)+49/6))/2, ((1393/36)^(1/2)-49/6)/2}
x in { (-((1393/36)^(1/2)+49/6))/2, ((1393/36)^(1/2)-49/6)/2 }
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