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D( n )
4*n-7 = 0
4*n-7 = 0
4*n-7 = 0
4*n-7 = 0 // + 7
4*n = 7 // : 4
n = 7/4
n in (-oo:7/4) U (7/4:+oo)
(3*n+5)/(4*n-7) = 0
3*n+5 = 0 // - 5
3*n = -5 // : 3
n = -5/3
n = -5/3
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