Question

-3 ≤ (2x-5)/3 ≤5 resolver

Answer 1

-3≤(2x-5)/3≤5
3{-3≤(2x-5)/3≤5}
-9≤2x-5≤15
-9+5≤ 2x ≤15+5
-4≤ 2x ≤ 20
-4/2 ≤ x ≤20/2
-2 ≤ x ≤ 10
C.S [-2;10] :)