oi I NEED HELP PLS 20 POINTS

Answer:
f = [tex]-\frac{5}{3}[/tex]
Step-by-step explanation:
Multiply both sides of the equation by [tex]-\frac{4}{3}[/tex]
f = -4/3 * 5/4
Simplify both sides of the equation.
f = [tex]-\frac{5}{3}[/tex]
i hope this helps :)