Can somebody solve this inequality; I need to know how to do it!

Start with
[tex] -1 \geq -2+\dfrac{a}{14} [/tex]
Add 2 to both sides:
[tex] 1 \geq \dfrac{a}{14} [/tex]
Multiply both sides by 14. Note that, since 14 is positive, we don't have to change the inequality sign:
[tex] 14 \geq a \iff a \leq 14 [/tex]