Answer:
f= -16
Step-by-step explanation:
[tex]f/4-5= -9\\\\\frac{f}{4}-5=-9\\\\\mathrm{Add\:}5\mathrm{\:to\:both\:sides}\\\\\frac{f}{4}-5+5=-9+5\\\\Simplify\\\\\frac{f}{4}=-4\\\\\mathrm{Multiply\:both\:sides\:by\:}4\\\frac{4f}{4}=4\left(-4\right)\\\\Simplify\\f=-16[/tex]
