Question

aflati numarul natural x x+5<9

Answer 1

0+5<9
1+5<9
2+5<9
3+5<9

Answer 2

$x+5\ \textless \ 9 \\ x\ \textless \ 9-5 \\ x\ \textless \ 4 \\ x \in (- \infty ,4) \\ x \in \{0;1;2;3\}$