Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.1 - Numerical and Algebraic Expressions - Problem Set 1.1 - Page 7: 34

$7$

Using order of operations, the given expression, $ \dfrac{7\cdot8+4}{5\cdot8-10}+\dfrac{9\cdot6-4}{6\cdot5-20} ,$ simplifies to \begin{array}{l}\require{cancel} \dfrac{56+4}{40-10}+\dfrac{54-4}{30-20} \\\\= \dfrac{60}{30}+\dfrac{50}{10} \\\\= 2+5 \\\\= 7 .\end{array}