[tex] \frac{23}{7} - \frac{14}{7} = \frac{9}{7} [/tex]
[tex] \frac{43}{11} - \frac{29}{11} = \frac{14}{11} [/tex]
[tex] \frac{89}{13} - \frac{78}{13} = \frac{11}{13} [/tex]
[tex] \frac{103}{19} - \frac{94}{19} = \frac{9}{19} [/tex]
