A kite is a quadrilateral, so the sum of its angle measures is 360°.
7x + 65 + 85 + 105 = 360
7x = 105 . . . . . . . . . . . . . . . . . subtract 255. This answers the second part of the question: the missing angle is 105°, so is congruent to the 105° angle given.
105/7 = x = 15 . . . . . . . . . . . . divide by the coefficient of x
