Решить уравнение x/20=40*30 210/x=420/60 x*110=110
X / 20 = 40 * 30 x / 20 = 1200 x = 1200 * 20 x = 24000 ----------------------- 210 / x = 420 / 60 420x = 210 * 60 x = 12600 : 420 x = 30 ----------------------- x * 110 = 110 x = 110 : 110 x = 1