Respuesta :

So the problem is:
-22>6 - 4f????

If so, then subtract 6 from both sides and get:
-28 >-4f

divide by -4 and flip the sign so 
7 < f
-22 > 6 - 4f
4f > 6 + 22 
4f > 28 |:4
f > 7
[tex]f\in (7; \ \infty)[/tex]