f) \( \left(\frac{1}{2}-\frac{1}{3}\right):\left(\frac{1}{6}: \frac{1}{2}-\frac{3}{2}: \frac{7}{3}\right) \)
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To simplify the given expression, we start by evaluating each part separately. First, calculate the left side of the expression: \[ \frac{1}{2} - \frac{1}{3} = \frac{3}{6} - \frac{2}{6} = \frac{1}{6}. \] Next, we evaluate the right side, starting with the divisions: \[ \frac{1}{6} : \frac{1}{2} = \frac{1}{6} \times \frac{2}{1} = \frac{2}{6} = \frac{1}{3}. \] Now let's solve the next part of the right side: \[ \frac{3}{2} : \frac{7}{3} = \frac{3}{2} \times \frac{3}{7} = \frac{9}{14}. \] Now, calculate the subtraction on the right side: \[ \frac{1}{3} - \frac{9}{14}. \] To subtract these fractions, we need a common denominator. The least common multiple of 3 and 14 is 42. \[ \frac{1}{3} = \frac{14}{42}, \quad \frac{9}{14} = \frac{27}{42}. \] Therefore, \[ \frac{1}{3} - \frac{9}{14} = \frac{14}{42} - \frac{27}{42} = \frac{14 - 27}{42} = \frac{-13}{42}. \] Now we can combine both sides of the main equation into one fraction: \[ \left(\frac{1}{6}\right) : \left(\frac{-13}{42}\right) = \frac{1}{6} \times \frac{42}{-13} = \frac{42}{-78} = -\frac{7}{13}. \] Thus, the final simplified result of the expression is: \[ -\frac{7}{13}. \]