Răspuns :
7ori x +5 mai mic sau egal cu 69
×mai mic sau egal =69-5:7
×mai mic sai egal ca 64:7
x mai mic sau egal ca 9
x€{0,1,2,3,4,5,6,7,8,9}
×mai mic sau egal =69-5:7
×mai mic sai egal ca 64:7
x mai mic sau egal ca 9
x€{0,1,2,3,4,5,6,7,8,9}
7x + 5 ≤ 69
7x ≤ 69 - 5
7x ≤ 64
x ≤ 64/7
x ∈ {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
7x ≤ 69 - 5
7x ≤ 64
x ≤ 64/7
x ∈ {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}