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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x-2 = (21/2)*x+3 // - (21/2)*x+3
14/x-((21/2)*x)-3-2 = 0
(-21/2)*x+14/x-3-2 = 0
14*x^-1-21/2*x^1-5*x^0 = 0
(14*x^0-21/2*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(14*x^0-21/2*x^2-5*x^1) = 0
x^1
(-21/2)*x^2-5*x+14 = 0
(-21/2)*x^2-5*x+14 = 0
DELTA = (-5)^2-(4*14*(-21/2))
DELTA = 613
DELTA > 0
x = (613^(1/2)+5)/(2*(-21/2)) or x = (5-613^(1/2))/(2*(-21/2))
x = (613^(1/2)+5)/(-21) or x = (5-613^(1/2))/(-21)
x in { (613^(1/2)+5)/(-21), (5-613^(1/2))/(-21)}
x in { (613^(1/2)+5)/(-21), (5-613^(1/2))/(-21) }
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