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D( x )
x^2+2*x+35 = 0
x^2+2*x+35 = 0
x^2+2*x+35 = 0
x^2+2*x+35 = 0
DELTA = 2^2-(1*4*35)
DELTA = -136
DELTA < 0
x in (-oo:+oo)
(5-x)/(x^2+2*x+35) = 0
x^2+2*x+35 = 0
x^2+2*x+35 = 0
DELTA = 2^2-(1*4*35)
DELTA = -136
DELTA < 0
1 = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x = 5
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