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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/4)*x-(1/x) = -5 // + 5
(7/4)*x-(1/x)+5 = 0
(7/4)*x-x^-1+5 = 0
7/4*x^1-1*x^-1+5*x^0 = 0
(7/4*x^2+5*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(7/4*x^2+5*x^1-1*x^0) = 0
x^1
(7/4)*x^2+5*x-1 = 0
(7/4)*x^2+5*x-1 = 0
DELTA = 5^2-(-1*4*(7/4))
DELTA = 32
DELTA > 0
x = (32^(1/2)-5)/(2*(7/4)) or x = (-32^(1/2)-5)/(2*(7/4))
x = 2/7*(4*2^(1/2)-5) or x = 2/7*(-4*2^(1/2)-5)
x in { 2/7*(-4*2^(1/2)-5), 2/7*(4*2^(1/2)-5)}
x in { 2/7*(-4*2^(1/2)-5), 2/7*(4*2^(1/2)-5) }
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