Addition and Subtraction of Algebraic Fractions

Express each of the following as a fraction in its simplest form.

1. \(4(x - 5y) - \left[ \frac{2(x - y)}{9} + \frac{y - 7x}{6} \right]\)
2. \(\frac{5}{2}(a - 3b) - \frac{b - 4a}{5} + \frac{5}{8}(b - a)\)