[tex]2\frac{1}{7} *(-\frac{14}{27})-\frac{3}{16}*(-2\frac{2}{9} )=-\frac{15}{7} *\frac{14}{27} +\frac{3}{16} *\frac{20}{9} = -5*\frac{2}{9} +\frac{1}{4} *\frac{5}{3} =-\frac{10}{9} +\frac{5}{12} =-\frac{25}{36}[/tex]

[tex](-3\frac{7}{9} +3\frac{2}{15} ):(\frac{1}{20}-(-\frac{13}{30} ) )=(-\frac{34}{9}+\frac{47}{15} ):(\frac{1}{20} +\frac{13}{30} )=-\frac{29}{45} :\frac{29}{60} = -\frac{29}{45} *\frac{60}{29}=-\frac{1}{3} *4=-\frac{4}{3}[/tex]

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