Tính : 2x + 1/3 - x - 4/4 ≤ 3x + 1/6 - x - 4/12

----- Nội dung ảnh -----
\[
c) \frac{2x+1}{3} - \frac{x-4}{4} \leq \frac{3x+1}{6} - \frac{x-4}{12}
\]