Explicație pas cu pas:
n+3|2n+16
n+3|2n+6
=> n+3|2n+16-2n-6 => n+3|10 => n+3€D10 in N =>
n+3€{1,2,5,10} =>
n€{-2,-1,2,7} => n€{2,7} solutie
2n+1|3n+9=>2n+1|6n+18
2n+1|2n+1=>2n+1|6n+3
=> 2n+1|6n+18-6n-3 => 2n+1|15 => 2n+1€D15 in N =>
2n+1€{1,3,5,15} =>
2n€{0,2,4,14} =>
n€{0,1,2,7}
4n+1|6n+15=>4n+1|12n+30
4n+1|4n+1=>4n+1|12n+3
=> 4n+1|12n+30-12n-3 => 4n+1|27 => 4n+1€D27 in N =>
4n+1€{1,3,9,27} =>
4n€{0,2,8,26} =>
n€{0,1/2,2,13/2} => n€{0,2} solutir
