\( \frac{2}{3} - 4 \left( \frac{1}{2} + \frac{3}{4} \right) \)

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1) \( \frac{2}{3} - 4 \left( \frac{1}{2} + \frac{3}{4} \right) \)
2) \( \frac{1}{7} + \frac{6}{7} \left( \frac{1}{2} - \frac{1}{3} \right) \)
3) \( \left( -\frac{1}{3} + \frac{5}{6} \right) \cdot 11 - 7 \)
4) \( \left( \frac{9}{10} - \frac{4}{5} \right) \cdot 2/5 + 1 \)
5) \( \frac{3}{2} - \frac{1}{2} \left( \frac{1}{4} - \frac{2}{3} \right) \)
6) \( \left( \frac{3}{4} + \frac{2}{3} \right) \cdot \frac{17}{24} - \frac{3}{4} \)