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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/7)*x+14 = 4/x-(6/7)+2 // - 4/x-(6/7)+2
(4/7)*x-(4/x)+6/7-2+14 = 0
(4/7)*x-4*x^-1+6/7-2+14 = 0
4/7*x^1-4*x^-1+90/7*x^0 = 0
(4/7*x^2+90/7*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(4/7*x^2+90/7*x^1-4*x^0) = 0
x^1
(4/7)*x^2+(90/7)*x-4 = 0
(4/7)*x^2+(90/7)*x-4 = 0
DELTA = (90/7)^2-(-4*4*(4/7))
DELTA = 8548/49
DELTA > 0
x = ((8548/49)^(1/2)-(90/7))/(2*(4/7)) or x = (-(90/7)-(8548/49)^(1/2))/(2*(4/7))
x = 7/8*((8548/49)^(1/2)-90/7) or x = -7/8*((8548/49)^(1/2)+90/7)
x in { -7/8*((8548/49)^(1/2)+90/7), 7/8*((8548/49)^(1/2)-90/7)}
x in { -7/8*((8548/49)^(1/2)+90/7), 7/8*((8548/49)^(1/2)-90/7) }
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