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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/7 = x-(4/x)+3 // - x-(4/x)+3
4/x-x+2/7-3 = 0
4*x^-1-1*x^1-19/7*x^0 = 0
(4*x^0-1*x^2-19/7*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-1*x^2-19/7*x^1) = 0
x^1
(-19/7)*x-x^2+4 = 0
(-19/7)*x-x^2+4 = 0
DELTA = (-19/7)^2-(-1*4*4)
DELTA = 1145/49
DELTA > 0
x = ((1145/49)^(1/2)-(-19/7))/(-1*2) or x = (-(-19/7)-(1145/49)^(1/2))/(-1*2)
x = ((1145/49)^(1/2)+19/7)/(-2) or x = (19/7-(1145/49)^(1/2))/(-2)
x in { ((1145/49)^(1/2)+19/7)/(-2), (19/7-(1145/49)^(1/2))/(-2)}
x in { ((1145/49)^(1/2)+19/7)/(-2), (19/7-(1145/49)^(1/2))/(-2) }
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