Evaluate the expression: 12÷(13+14)×0.5\frac{1}{2} \div (\frac{1}{3} + \frac{1}{4}) \times 0.521÷(31+41)×0.5.
37\frac{3}{7}73
67\frac{6}{7}76
12\frac{1}{2}21
712\frac{7}{12}127