Explicație pas cu pas:
[tex]x + 3 < 11 \\ x < 11 - 3 \\ x < 8[/tex]
=> x ∈ {0, 1, 2, 3, 4, 5, 6, 7}
[tex]x - 7 < 13 \\ x < 13 + 7 \\ x < 20[/tex]
=> x ∈ {0, 1, 2, 3, 4,..., 17, 18, 19}
[tex]x - 3 < 6 \\ x < 6 + 3 \\ x < 9[/tex]
=> x ∈ {0, 1, 2, 3, 4, 5, 6, 7, 8}
[tex]x + x \leqslant 10 \\ x \leqslant 10 - 4 \\ x \leqslant 6[/tex]
=> x ∈ {0, 1, 2, 3, 4, 5, 6}
[tex]2 + x \leqslant 12 \\ x \leqslant 12 - 2 \\ x \leqslant 10[/tex]
=> x ∈ {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
