Explicație pas cu pas:
3n+2|9n+17
3n+2|3n+2=>3n+2|9n+6
=>3n+2|9n+17-9n-6=>3n+2|11 => 3n+2€D11 in Z =>
3n+2€{-11,-1,1,11} =>
3n€{-13,-3,-1,9}=>
n€{-13/3,-1,-1/3,3}
