3) ABCD is a cyclic quadrilateral such that < A = 2x + 4, < B = y + 3, < C = 2y + 10, < D = 4x - 5 find all angles​

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30