2/25x + (16/25-4/5) = 3 2/5 : 5/6
2/25x + (16/25 - 4/5) = 17/5 * 6/5
2/25x + (16/25 - 4/5) = 102/25
2/25x + (-4/25) = 102/25
2/25x - 4/25 = 102/25
2x - 4 = 102
2x = 106
x = 53
ответ: 53.
2/25x + (16/25-4/5) = 3 2/5 : 5/6
2/25x + (16/25 - 4/5) = 17/5 * 6/5
2/25x + (16/25 - 4/5) = 102/25
2/25x + (-4/25) = 102/25
2/25x - 4/25 = 102/25
2x - 4 = 102
2x = 106
x = 53
ответ: 53.