4/15+y/15=1 8/15-y/15=0 19/15-y/15=1 1-y/15=11/15
4/15 + у/15 = 1 8/15 - у/15 = 0 у/15 = 1 - 4/15 8/15 = у/15 у/15 = 11/15 у = 8/15 * 15 у = 11/15 * 15 у = 8 у = 11 19/15 - у/15 = 1 1 - у/15 = 11/15 у/15 = 19/15 - 1 у/15 = 1 - 11/15 у/15 = 4/15 у/15= 4/15 у = 4/15 * 15 у = 4/15 * 15 у = 4 у = 4