13x = 20 + 1913x = 39x = 39 / 13x = 3
56 / x = 20 + 856 / x = 28x = 56 / 28x = 2
Ответ: x = 3 и x = 2.
13x = 20 + 19
13x = 39
x = 39 / 13
x = 3
56 / x = 20 + 8
56 / x = 28
x = 56 / 28
x = 2
Ответ: x = 3 и x = 2.