3) 8^(-x+4) > 4

1. Rewrite the inequality with the same base: $$(2^3)^{-x+4} > 2^2$$

2. Simplify the left side: $$2^{-3x+12} > 2^2$$

3. Compare exponents: $$-3x+12 > 2 > -3x > -10 > x < 10/3$$.