j: \(\dfrac{5}{-4}+\dfrac{-18}{4}=\dfrac{-5}{4}+\dfrac{-18}{4}=\dfrac{-5-18}{4}=-\dfrac{23}{4}\)
k: \(\dfrac{5}{7}-\dfrac{6}{7}=\dfrac{5-6}{7}=\dfrac{-1}{7}\)
l: \(-\dfrac{3}{5}-\dfrac{12}{5}=\dfrac{-3-12}{5}=-\dfrac{15}{5}=-3\)
m: \(\dfrac{3}{8}-\dfrac{5}{-8}=\dfrac{3}{8}+\dfrac{5}{8}=\dfrac{8}{8}=1\)
n: \(\dfrac{11}{-6}-\dfrac{7}{6}=\dfrac{-11}{6}-\dfrac{7}{6}=\dfrac{-11-7}{6}=-\dfrac{18}{6}=-3\)
o: \(\dfrac{4}{9}-\dfrac{-5}{-9}=\dfrac{4}{9}-\dfrac{5}{9}=\dfrac{4-5}{9}=-\dfrac{1}{9}\)
p: \(\dfrac{13}{-7}-\dfrac{1}{-7}=\dfrac{13-1}{-7}=\dfrac{14}{-7}=-2\)
q: \(\dfrac{13}{11}-\dfrac{2}{-11}=\dfrac{13}{11}+\dfrac{2}{11}=\dfrac{13+2}{11}=\dfrac{15}{11}\)
r: \(\dfrac{12}{5}-\dfrac{7}{-5}=\dfrac{12}{5}+\dfrac{7}{5}=\dfrac{12+7}{5}=\dfrac{19}{5}\)
s: \(-\dfrac{11}{6}-\dfrac{1}{-6}=\dfrac{-11}{6}+\dfrac{1}{6}=\dfrac{-11+1}{6}=-\dfrac{10}{6}=-\dfrac{5}{3}\)
t: \(-\dfrac{1}{11}-\dfrac{10}{11}=\dfrac{-1-10}{11}=\dfrac{-11}{11}=-1\)
u: \(\dfrac{7}{4}-\dfrac{-3}{4}=\dfrac{7}{4}+\dfrac{3}{4}=\dfrac{10}{4}=\dfrac{5}{2}\)
