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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+5 = 14/x // - 14/x
x-(14/x)+5 = 0
x-14*x^-1+5 = 0
1*x^1-14*x^-1+5*x^0 = 0
(1*x^2+5*x^1-14*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+5*x^1-14*x^0) = 0
x^1
x^2+5*x-14 = 0
x^2+5*x-14 = 0
DELTA = 5^2-(-14*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)-5)/(1*2) or x = (-81^(1/2)-5)/(1*2)
x = 2 or x = -7
x in { -7, 2}
x in { -7, 2 }
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