Choice A is the correct answer. Combining like terms after distribution simplifies the inequality.

1. Distribute: $5x - 2x + 6 < 18$ (note: $-2(x-3) = -2x + 6$)
2. Combine like terms: $3x + 6 < 18$
3. Subtract 6: $3x < 12$
4. Divide by 3: $x < 4$

?�� Strategic Tip: When distributing $-2(x-3)$, remember both terms get multiplied: $-2x$ and $-2(-3) = +6$.

Choice B is incorrect because it reverses the inequality without mathematical reason. Choice C is incorrect because it might skip combining like terms properly (5x - 2x). Choice D is incorrect because it combines wrong value and wrong direction.