Уравнение 5(n – 8) – 3(4 – 2n) = 7(3n – 7) + 9

Решим уравнение: 5 * (n – 8) – 3 * (4 – 2 * n) = 7 * (3 * n – 7) + 9, 5 * n - 40 - 12 + 6 * n = 21 * n - 49 + 9, 11 * n - 52 = 21 * n - 40, 11 * n - 21 * n = 52 - 40, -10 * n = 12, n = -1,2.