12x - x - 55 = 0
11x - 55 = 0
11x = 55
x = 55 : 11
x = 5
ПРОВЕРКА:
12 * 5 - 5 - 55 = 0
60 - 5 - 55 = 0
55 - 55 = 0
0 = 0
ОТВЕТ: 5
12x - x - 55 = 0
11x - 55 = 0
11x = 55
x = 55 : 11
x = 5
ПРОВЕРКА:
12 * 5 - 5 - 55 = 0
60 - 5 - 55 = 0
55 - 55 = 0
0 = 0
ОТВЕТ: 5