add 3 on both sides: 2I5-2xI≤18
divide 2 on both sides: I5-2xI≤9
-9≤5-2x≤9
subtract 5: -14≤-2x≤4
divide by -2. Remember: when divided by a negative number, the inequality symbol changes direction. so we have7 ≥x≥-2
rewrite it: -2≤x≤7
so the answer is C
you were right.
