Angle P and Angle Q have the same angle (we know this because of the lines on the sides). A triangle's angles must alway equal 180 when added. We have two angles of 29 which equals 58 when added together. That means (if we subtract 180 - 58) the missing angle must equal 122. We solve for x by doing 122 = 8x - 14. We add 14 to both sides to get 8x = 136 then divide everything by 8 to get x = 17.
