Сколько будет 12-2*(K+3)=26?
12 - 2 * (k + 3) = 26 12 - 2k - 6 = 26 - 2k = 26 - 12 + 6 - 2k = 20 k = 20 : (-2) k = - 10 Проверка: 12 - 2 * (-10 + 3) = 26 12 - 2 * (-7) = 26 12 + 14 = 26 26 = 26