Question 150847
See here --> http://www.purplemath.com/modules/logrules.htm

use rule 3 first
{{{7lnx + 4lny -3lnz}}}
{{{ln(x)^7 + ln(y)^4 - ln(z)^3}}}

Now use rule 2
{{{ln((x)^7 *(y)^4) - ln(z)^3}}}

Now rule 2 again

{{{ln((x^7y^4)/z^3)}}}