Where is the number 3 − 6 located on a horizontal number line? 3 units to the left of 3 3 units to the right of 3 6 units to the right of 3 6 units to the left of 3

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