Two adjacent angles have a sum of 100 degrees. The angles have measures angle 1 = 20 degrees and angle 2 = (3x + 15) degrees. What equation can be used to solve for x?
3x + 115 = 20
3x - 20 =100
3x - 100 = 20
3x + 35 =100
3x + 115 = 20
3x - 20 =100
3x - 100 = 20
3x + 35 =100