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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
9/h+2 = 7/h+2 // - 7/h+2
9/h-(7/h)-2+2 = 0
9/h-7*h^-1-2+2 = 0
2*h^-1 = 0 // : 2
h^-1 = 0
h naleu017Cy do O
h belongs to the empty set
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