80 + x = 84x = 84 - 80x = 4
x + 6 = 22x = 22 - 6x = 16
x - 7 = 20x = 20 + 7x = 27
Ответ: x = 4, x = 16, x = 27.
80 + x = 84
x = 84 - 80
x = 4
x + 6 = 22
x = 22 - 6
x = 16
x - 7 = 20
x = 20 + 7
x = 27
Ответ: x = 4, x = 16, x = 27.