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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(1/7) = (1/2)*x-(3/4) // - (1/2)*x-(3/4)
3/x-((1/2)*x)-(1/7)+3/4 = 0
(-1/2)*x+3/x-1/7+3/4 = 0
3*x^-1-1/2*x^1+17/28*x^0 = 0
(17/28*x^1-1/2*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(17/28*x^1-1/2*x^2+3*x^0) = 0
x^1
(-1/2)*x^2+(17/28)*x+3 = 0
(-1/2)*x^2+(17/28)*x+3 = 0
DELTA = (17/28)^2-(3*4*(-1/2))
DELTA = 4993/784
DELTA > 0
x = ((4993/784)^(1/2)-(17/28))/(2*(-1/2)) or x = (-(17/28)-(4993/784)^(1/2))/(2*(-1/2))
x = 17/28-(4993/784)^(1/2) or x = (4993/784)^(1/2)+17/28
x in { 17/28-(4993/784)^(1/2), (4993/784)^(1/2)+17/28}
x in { 17/28-(4993/784)^(1/2), (4993/784)^(1/2)+17/28 }
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