5 4/15 - 3 4/7 * x = 4 2/3
3 4/7 * x = 5 4/15 - 4 2/3
3 4/7 * x = 79/15 - 14/3
3 4/7 * x = 79/15 - 70/15
3 4/7 * x = 9/15
3 4/7 * x = 3/5
x = 3/5 : 3 4/7
x = 3/5 : 25/7
x = 3/5 * 7/25
x = 21/125
ответ: 21/125
5 4/15 - 3 4/7 * x = 4 2/3
3 4/7 * x = 5 4/15 - 4 2/3
3 4/7 * x = 79/15 - 14/3
3 4/7 * x = 79/15 - 70/15
3 4/7 * x = 9/15
3 4/7 * x = 3/5
x = 3/5 : 3 4/7
x = 3/5 : 25/7
x = 3/5 * 7/25
x = 21/125
ответ: 21/125