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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/5)*x+10 = 5/x-(6/5)+2 // - 5/x-(6/5)+2
(7/5)*x-(5/x)+6/5-2+10 = 0
(7/5)*x-5*x^-1+6/5-2+10 = 0
7/5*x^1-5*x^-1+46/5*x^0 = 0
(7/5*x^2+46/5*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(7/5*x^2+46/5*x^1-5*x^0) = 0
x^1
(7/5)*x^2+(46/5)*x-5 = 0
(7/5)*x^2+(46/5)*x-5 = 0
DELTA = (46/5)^2-(-5*4*(7/5))
DELTA = 2816/25
DELTA > 0
x = ((2816/25)^(1/2)-(46/5))/(2*(7/5)) or x = (-(46/5)-(2816/25)^(1/2))/(2*(7/5))
x = 5/14*((2816/25)^(1/2)-46/5) or x = -5/14*((2816/25)^(1/2)+46/5)
x in { -5/14*((2816/25)^(1/2)+46/5), 5/14*((2816/25)^(1/2)-46/5)}
x in { -5/14*((2816/25)^(1/2)+46/5), 5/14*((2816/25)^(1/2)-46/5) }
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