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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-5/x-6 = (7/4)*x-24+2 // - (7/4)*x-24+2
24-((7/4)*x)-5/x-6-2 = 0
(-7/4)*x-5/x-6-2+24 = 0
16*x^0-7/4*x^1-5*x^-1 = 0
(16*x^1-7/4*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(16*x^1-7/4*x^2-5*x^0) = 0
x^1
(-7/4)*x^2+16*x-5 = 0
(-7/4)*x^2+16*x-5 = 0
DELTA = 16^2-(-5*4*(-7/4))
DELTA = 221
DELTA > 0
x = (221^(1/2)-16)/(2*(-7/4)) or x = (-221^(1/2)-16)/(2*(-7/4))
x = -2/7*(221^(1/2)-16) or x = 2/7*(221^(1/2)+16)
x in { -2/7*(221^(1/2)-16), 2/7*(221^(1/2)+16)}
x in { -2/7*(221^(1/2)-16), 2/7*(221^(1/2)+16) }
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