recall that when \(\displaystyle \sin\theta = \frac{\sqrt{3}}{2}\)
then \(\displaystyle \theta = \frac{2\pi}{3} \), \(\displaystyle \frac{\pi}{3}\)

so in this case \(\displaystyle \theta = 30 - x\) if assuming that \(\displaystyle 30 \) means \(\displaystyle 30^o \) then you can calculate the values for x