\(tan\left(3x-30^o\right)=-\dfrac{\sqrt{3}}{2}\)
\(3x-30^o=arctan\left(-\dfrac{\sqrt{3}}{2}\right)+k\pi\)
\(3x=30^o+arctan\left(-\dfrac{\sqrt{3}}{2}\right)+k\pi\)
\(x=10^o+\dfrac{arctan\left(-\dfrac{\sqrt{3}}{2}\right)}{3}+k.\dfrac{\pi}{3}\)
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