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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/3 = -1/x-7 // + -1/x-7
x/3-(-1/x)+7 = 0
x/3+x^-1+7 = 0
1/3*x^1+1*x^-1+7*x^0 = 0
(1/3*x^2+7*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2+7*x^1+1*x^0) = 0
x^1
(1/3)*x^2+7*x+1 = 0
(1/3)*x^2+7*x+1 = 0
DELTA = 7^2-(1*4*(1/3))
DELTA = 143/3
DELTA > 0
x = ((143/3)^(1/2)-7)/(2*(1/3)) or x = (-(143/3)^(1/2)-7)/(2*(1/3))
x = 3/2*((143/3)^(1/2)-7) or x = -3/2*((143/3)^(1/2)+7)
x in { -3/2*((143/3)^(1/2)+7), 3/2*((143/3)^(1/2)-7)}
x in { -3/2*((143/3)^(1/2)+7), 3/2*((143/3)^(1/2)-7) }
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