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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/4)*x-1 = 2/x+1 // - 2/x+1
(7/4)*x-(2/x)-1-1 = 0
(7/4)*x-2*x^-1-1-1 = 0
7/4*x^1-2*x^-1-2*x^0 = 0
(7/4*x^2-2*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(7/4*x^2-2*x^1-2*x^0) = 0
x^1
(7/4)*x^2-2*x-2 = 0
(7/4)*x^2-2*x-2 = 0
DELTA = (-2)^2-(-2*4*(7/4))
DELTA = 18
DELTA > 0
x = (18^(1/2)+2)/(2*(7/4)) or x = (2-18^(1/2))/(2*(7/4))
x = 2/7*(3*2^(1/2)+2) or x = 2/7*(2-3*2^(1/2))
x in { 2/7*(2-3*2^(1/2)), 2/7*(3*2^(1/2)+2)}
x in { 2/7*(2-3*2^(1/2)), 2/7*(3*2^(1/2)+2) }
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