Let the number be y, subtract y from 2 i.e 2 - y2 - y = 4 < 15 y,
2 - y = y5 - 42 - y + 4 = y56 = y5 + y
6 = y+5y5
6 = 6y5
multiplying through by 56 * 5 = 6y306 = y= 5
