Question 344442
If by Your question, You are stating the following to be true:
{{{(3n-4)/(4n-3n)=-1}}}

Simplify

{{{(3n-4)/n=-1}}}
Multiply both sides of the equation by n
{{{(3n-4)=-n}}}
add -n to both sides of the equation
{{{4n-4=0}}}
{{{4n=4}}}
n=1