72/(10-X) = 18Перемножаем обе части уравнения на (10-X):72 = 18(10-X)72 = 180 - 18X18X = 180 - 7218X = 108X = 108/18X = 6
(23-X) - 7 = 1223 - X - 7 = 1216 - X = 12-X = 12 - 16-X = -4X = 4
Ответ: X = 6, 4.
72/(10-X) = 18
Перемножаем обе части уравнения на (10-X):
72 = 18(10-X)
72 = 180 - 18X
18X = 180 - 72
18X = 108
X = 108/18
X = 6
(23-X) - 7 = 12
23 - X - 7 = 12
16 - X = 12
-X = 12 - 16
-X = -4
X = 4
Ответ: X = 6, 4.