Given ${\displaystyle \underset{3}{\overset{6}{}}}f(x)dx=3,{\displaystyle \underset{6}{\overset{7}{}}}g(x)dx=6,{\displaystyle \underset{6}{\overset{7}{}}}h(x)dx=-7,$ and ${\displaystyle \underset{6}{\overset{3}{}}}f(x)dx={\displaystyle \underset{6}{\overset{7}{}}}\frac{4h(x)-g(x)}{2}dx={\displaystyle \underset{7}{\overset{3}{}}}r(x)dx=$