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