[tex](\frac{7}{9} +\frac{17}{10} -\frac{1}{18} )-(\frac{13}{27} -\frac{1}{18} +\frac{7}{9} )+(\frac{1}{10} +\frac{1}{15} +\frac{1}{9} )=\\\\(\frac{70+153-5}{90} )- (\frac{26-3+42}{54} )+ (\frac{9+ 6+10}{90} )=\\\\\frac{218}{90} - \frac{65}{54} +\frac{25}{90} =\\\\(\frac{654-325+75}{270} ) =\\\\\frac{404}{270} =
[tex]\frac{202}{135}[/tex]
