+1005 So we have this quadrilateral, which has a total of 360 degrees. So. 2 are 90 degree angles, so 180 degrees. 360-180 = 180.
15x+8 + 10x - 3 = 25x +5 = 180. Subtract 5 from both sides give 25x = 175. Divide 25 on both sides gives x = 7. 10*7 -3 = 70-3 = 67.
If you don't understand anything feel free to ask!
