\(\dfrac{5}{6}+\dfrac{-3}{4}=\dfrac{10}{12}-\dfrac{9}{12}=\dfrac{1}{12}\)
\(\dfrac{1}{3}+\dfrac{-2}{5}=\dfrac{5}{15}-\dfrac{6}{15}=-\dfrac{1}{15}\)
\(-\dfrac{5}{12}+\dfrac{7}{8}=-\dfrac{10}{24}+\dfrac{21}{24}=\dfrac{11}{24}\)
\(-\dfrac{3}{8}+\dfrac{1}{6}=-\dfrac{9}{24}+\dfrac{4}{24}=-\dfrac{5}{24}\)