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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-((x^2)/x)-14 = 0
4-x-14 = 0
-x-10 = 0 // + 10
-x = 10 // * -1
x = -10
x = -10
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