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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(50/x) < 5 // - 5
x-(50/x)-5 < 0
x-50*x^-1-5 < 0
x-50*x^-1-5 = 0
1*x^1-50*x^-1-5*x^0 = 0
(1*x^2-5*x^1-50*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-5*x^1-50*x^0) = 0
x^1
x^2-5*x-50 = 0
x^2-5*x-50 = 0
DELTA = (-5)^2-(-50*1*4)
DELTA = 225
DELTA > 0
x = (225^(1/2)+5)/(1*2) or x = (5-225^(1/2))/(1*2)
x = 10 or x = -5
x in { -5, 10}
(x+5)*(x-10) < 0
(-oo:-5) (-5:10) (10:+oo) x+5 - + + x-10 - - +
x in (-5:0) U (0:10)
(-5:0) U (0:10)
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