I dont get this att alll
u have a 90 degree angle....so ur 2 angles add up to 90 degreesx + 5 + x - 5 = 902x = 90x = 90/2x = 45so ur angle x + 5 = 45 + 5 = 50 degreesand ur angle x - 5 = 45 - 5 = 40 degrees