Answer
$\dfrac{8}{4x-7}$
Work Step by Step
When adding two fractions with common denominators, we add or subtract the numerators and copy the denominator. Therefore, the given expression, $
\dfrac{11}{4x-7}-\dfrac{3}{4x-7}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{11-3}{4x-7}
\\\\=
\dfrac{8}{4x-7}
.\end{array}