−6+3(5f−5)≤−10f−8−5

Sure, let's solve the inequality step by step:

1. Distribute the 3 in the parentheses on the left side of the inequality: -6 + 15f - 15 ≤ -10f - 8 - 5
2. Simplify both sides of the inequality: 15f - 21 ≤ -10f - 13
3. Add 10f to both sides to get all the f terms on one side: 25f - 21 ≤ -13
4. Add 21 to both sides to isolate the f term: 25f ≤ 8
5. Divide both sides by 25 to solve for f: f ≤ 8/25

So, the solution to the inequality is f ≤ 8/25.