$(1$ point$)$ Suppose ${\displaystyle \underset{-4}{\overset{0\mathrm{.}5}{}}}f(x)dx=8,{\displaystyle \underset{-4}{\overset{-2\mathrm{.}5}{}}}f(x)dx=9,{\displaystyle \underset{-1}{\overset{0\mathrm{.}5}{}}}f(x)dx=8$

${\displaystyle \underset{-2\mathrm{.}5}{\overset{-1}{}}}f(x)dx=$

${\displaystyle \underset{-1}{\overset{-2\mathrm{.}5}{}}}(8f(x)-9)dx=$