Ответ:Решение:x : 6 = 5x = 5 \(\times\) 6x = 30x : 9 = 5x = 5 \(\times\) 9x = 45x : 7 = 6x = 6 \(\times\) 7x = 42Ответ: x = 30, x = 45, x = 42.