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D( x )
x^2+6 = 0
x^2+6 = 0
x^2+6 = 0
1*x^2 = -6 // : 1
x^2 = -6
x in (-oo:+oo)
(15*x+2)/(x^2+6) = 0
15*x+2 = 0 // - 2
15*x = -2 // : 15
x = -2/15
x = -2/15
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