[tex] \frac{4}{9} + \frac{3}{9} - \frac{5}{9} = \frac{4 + 3 - 5}{9} = \frac{2}{9} [/tex]
[tex] \frac{8}{12} - \frac{4}{12 } + \frac{6}{12} - \frac{3}{12} = \frac{8 - 4 + 6 - 3}{12} = \frac{7}{12} [/tex]
