a: \(A=49+\dfrac{8}{23}-5-\dfrac{7}{32}-14-\dfrac{8}{23}\)
\(=20-\dfrac{7}{32}=\dfrac{633}{32}\)
b: \(=\left(-7\right)\left(\dfrac{4}{9}+6+\dfrac{5}{9}\right)=-7\cdot7=-49\)
c: \(=17+\dfrac{2}{31}-\dfrac{15}{17}-6-\dfrac{2}{31}=11-\dfrac{15}{17}=\dfrac{172}{17}\)