Question

E={x|x apartine N, 13< 3x - 5 mai mic sau egal cu 22}​

Answer 1

$13 < 3x-5\leq 22$ |+5

$18 < 3x \leq 27$ | :3

$6 < x \leq 9$

=> x apartine multimii {7,8,9}

E={7,8,9}