1) x - 27 = 54x = 54 + 27x = 81
2) 100 - x = 63x = 100 - 63x = 37
3) x + 18 = 67x = 67 - 18x = 49
Ответ: x = 81, x = 37, x = 49.
1) x - 27 = 54
x = 54 + 27
x = 81
2) 100 - x = 63
x = 100 - 63
x = 37
3) x + 18 = 67
x = 67 - 18
x = 49
Ответ: x = 81, x = 37, x = 49.