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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+5 = 3*x-10 // - 3*x-10
2/x-(3*x)+5+10 = 0
2/x-3*x+5+10 = 0
2*x^-1-3*x^1+15*x^0 = 0
(15*x^1-3*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^1-3*x^2+2*x^0) = 0
x^1
15*x-3*x^2+2 = 0
15*x-3*x^2+2 = 0
DELTA = 15^2-(-3*2*4)
DELTA = 249
DELTA > 0
x = (249^(1/2)-15)/(-3*2) or x = (-249^(1/2)-15)/(-3*2)
x = (249^(1/2)-15)/(-6) or x = (249^(1/2)+15)/6
x in { (249^(1/2)-15)/(-6), (249^(1/2)+15)/6}
x in { (249^(1/2)-15)/(-6), (249^(1/2)+15)/6 }
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