3. Решите уравнение: a) x/4 - x/5 = 3 б) (2a + 3)/18 - (9 - a)/6 = 1/3

a) x/4 - x/5 = 3 (5x - 4x) / 20 = 3 x / 20 = 3 x = 3 * 20 x = 60 б) (2a + 3)/18 - (9 - a)/6 = 1/3 (2a + 3)/18 - (3 * (9 - a)) / 18 = 6/18 (2a + 3 - 27 + 3a) / 18 = 6/18 5a - 24 = 6 5a = 30 a = 6 Ответы: a) x = 60 б) a = 6