\(\left(\frac{3}{4} - \frac{1}{6}\right) \cdot 3 = \left(\frac{9}{12} - \frac{2}{12}\right) \cdot 3 = \frac{7}{12} \cdot 3 = \frac{7 \cdot 3}{12} = \frac{21}{12} = \frac{7}{4}\)
Ответ: \(\frac{7}{4}\)