Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.1 - Numerical and Algebraic Expressions - Problem Set 1.1 - Page 7: 29

$14$

Using order of operations, the given expression, $ \dfrac{6(8-3)}{3}+\dfrac{12(7-4)}{9} ,$ simplifies to \begin{array}{l}\require{cancel} \dfrac{6(5)}{3}+\dfrac{12(3)}{9} \\\\= \dfrac{30}{3}+\dfrac{36}{9} \\\\= 10+4 \\\\= 14 .\end{array}