find x for tan (x) = 7/12

atan(7/12)

$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{tan}}^{\!\!\mathtt{-1}}{\left({\frac{{\mathtt{7}}}{{\mathtt{12}}}}\right)} = {\mathtt{30.256\: \!437\: \!163\: \!529^{\circ}}}$$

That is just the first quadrant answer, it may also equal  180+30=210 degrees