Ответ:\(x + 6 = 49\)\(x = 49 - 6\)\(x = 43\)\(y - 50 = 28\)\(y = 28 + 50\)\(y = 78\)\(74 - x = 30\)\(x = 74 - 30\)\(x = 44\)Ответ: x = 43; y = 78; x = 44.