1) 850 - x = 90x = 850 - 90x = 760
2) x ÷ 7 = 84x = 7 * 84x = 588
3) x + 390 = 350x = 350 - 390x = -40
Ответ: x = 760, x = 588, x = -40
1) 850 - x = 90
x = 850 - 90
x = 760
2) x ÷ 7 = 84
x = 7 * 84
x = 588
3) x + 390 = 350
x = 350 - 390
x = -40
Ответ: x = 760, x = 588, x = -40