Answer
$-\dfrac{8}{25}$
Work Step by Step
Using order of operations, the expression $
\dfrac{3-7-(7-3)}{15+30\div6\cdot2}
$ simplifies to
\begin{array}{l}
\dfrac{-4-4}{15+5\cdot2}
\\\\=
\dfrac{-8}{15+10}
\\\\=
\dfrac{-8}{25}
\\\\=
-\dfrac{8}{25}
.\end{array}
