Question

dy/dx (ln(8x))/(9-ln(7x))

Answer 1

\[ {\frac {1}{x \left( 9-\ln \left( 7\,x \right) \right) }}+{\frac {
\ln \left( 8\,x \right) }{ \left( 9-\ln \left( 7\,x \right)
\right) ^{2}x}}
\]

Answer 2

how did you get that?

Answer 3

Just use quotient rule.