$$\frac { a } { b } \frac { 8 a + 5 b } { 8 a - 5 b } = \frac { 7 } { 3 }$$
$a=\frac{\sqrt{-1679b^{2}}+41b}{48}$
$a=\frac{-\sqrt{-1679b^{2}}+41b}{48}\text{, }b\neq 0$
$b=\frac{\sqrt{-1679a^{2}}+41a}{70}$
$b=\frac{-\sqrt{-1679a^{2}}+41a}{70}\text{, }a\neq 0$
