Chapter R - Section R.3 - Exponents, Roots, and Order of Operations - R.3 Exercises - Page 30: 72

$-1$

Using order of operations, the given expression, $ -12\left(-\dfrac{3}{4}\right)-(6\cdot5\div3) ,$ simplifies to \begin{array}{l}\require{cancel} -\cancel{12}^3\left(-\dfrac{3}{\cancel{4}}\right)-(30\div3) \\\\= 9-10 \\\\= -1 .\end{array}