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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+4 = 16/x+4 // - 16/x+4
2/x-(16/x)-4+4 = 0
2/x-16*x^-1-4+4 = 0
-14*x^-1 = 0 // : -14
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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