Question 976121
Assume the problem is:
{{{91/(m^2-169)}}}
-----------
{{{7/(2(m+13))}}}
:
Invert the dividing fraction and multiply
{{{91/(m^2-169)}}} * {{{(2(m+13))/7}}}
Factor the 1st denominator, the difference of squares
{{{91/((m-13)(m+13))}}} * {{{(2(m+13))/7}}}
Cancel 7 into 91 and the (m+13)'s
{{{(13*2)/(m-13)}}} = {{{26/(m-13)}}}