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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+3/x = 7/4 // - 7/4
2*x+3/x-(7/4) = 0
2*x+3/x-7/4 = 0
2*x^1+3*x^-1-7/4*x^0 = 0
(2*x^2-7/4*x^1+3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-7/4*x^1+3*x^0) = 0
x^1
2*x^2+(-7/4)*x+3 = 0
2*x^2+(-7/4)*x+3 = 0
DELTA = (-7/4)^2-(2*3*4)
DELTA = -335/16
DELTA < 0
x in { }
x belongs to the empty set
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