How do u make the equation and how do u solve it

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x