In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
3/4 a > - 16
a = ?
Step 02:
[tex]\begin{gathered} \frac{3}{4}\text{ a }\cdot\text{ 4 > - 16 }\cdot\text{ 4 } \\ 3\text{ a / 3 > }-64\text{ / 3 } \\ a\text{ > - }21.33\text{ } \end{gathered}[/tex]The answer is:
a > -21.33
a > - 64 / 3