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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/2)*x = 3/x-5 // - 3/x-5
(7/2)*x-(3/x)+5 = 0
(7/2)*x-3*x^-1+5 = 0
7/2*x^1-3*x^-1+5*x^0 = 0
(7/2*x^2+5*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(7/2*x^2+5*x^1-3*x^0) = 0
x^1
(7/2)*x^2+5*x-3 = 0
(7/2)*x^2+5*x-3 = 0
DELTA = 5^2-(-3*4*(7/2))
DELTA = 67
DELTA > 0
x = (67^(1/2)-5)/(2*(7/2)) or x = (-67^(1/2)-5)/(2*(7/2))
x = (67^(1/2)-5)/7 or x = (-(67^(1/2)+5))/7
x in { (-(67^(1/2)+5))/7, (67^(1/2)-5)/7}
x in { (-(67^(1/2)+5))/7, (67^(1/2)-5)/7 }
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