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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-((7/14)*x)+(2/56)*x-(14/x)+8 = 0
2*x+(-1/2)*x+(2/56)*x-14*x^-1+8 = 0
43/28*x^1-14*x^-1+8*x^0 = 0
(43/28*x^2+8*x^1-14*x^0)/(x^1) = 0 // * x^2
x^1*(43/28*x^2+8*x^1-14*x^0) = 0
x^1
(43/28)*x^2+8*x-14 = 0
(43/28)*x^2+8*x-14 = 0
DELTA = 8^2-(-14*4*(43/28))
DELTA = 150
DELTA > 0
x = (150^(1/2)-8)/(2*(43/28)) or x = (-150^(1/2)-8)/(2*(43/28))
x = 14/43*(5*6^(1/2)-8) or x = 14/43*(-5*6^(1/2)-8)
x in { 14/43*(-5*6^(1/2)-8), 14/43*(5*6^(1/2)-8)}
x in { 14/43*(-5*6^(1/2)-8), 14/43*(5*6^(1/2)-8) }
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