[tex] (\frac{4}{3}) ^{3} [/tex] - [tex] (\frac{9}{7})^{-2} [/tex]
[tex] \frac{64}{27} - \frac{ \frac{1}{9 ^{2} } }{ \frac{1}{7 ^{2} } } [/tex]
[tex] \frac{64}{27} - \frac{1}{81} [/tex] x49
[tex] \frac{64}{27} - \frac{49}{81}[/tex]
[tex] \frac{143}{81} [/tex]
