[tex]\begin{gathered} \text{Let the third angle be }\theta. \\ \text{Therefore} \\ \theta+126+28=180\text{ (Sum of angles in a triangle)} \\ \Rightarrow\theta=26\text{degrees} \end{gathered}[/tex]
Using sine rule, we have:
[tex]\begin{gathered} \frac{x}{\sin(28deg)}=\frac{8.2}{\sin (26deg)} \\ \Rightarrow\text{ x=}\frac{8.2\sin (28\text{deg)}}{\sin (26\text{deg)}} \\ \Rightarrow\text{ x=8.8} \end{gathered}[/tex]
