Start with
[tex] -2 \geq \cfrac{p}{16} - 3 [/tex]
Add 3 to both sides:
[tex] 1 \geq \cfrac{p}{16} [/tex]
Multiply both sides by 16: since 16 is positive, we don't need to change the direction of the inequality sign:
[tex] 16 \geq p [/tex]
Which you can rewrite as
[tex] p \leq 16 [/tex]
