12÷3,2+(6-(3,7/8-15/6)×6/7)

1) 3 7/8 - 15/6 = 31/8 - 15/6 = (31*3)/24 - (15*4)/24 = 93/24 - 60/24 = 33/24
2) 33/24 * 6/7 = 33/4 * 1/7 = 33/28 = 1ц 5/28
3) 6 - 1ц 5/28 = 4ц 23/28
4) 12 : 32/10 =  15/4 = 3ц 3/4
5) 3ц 3/4 + 4ц 23/28 = 7ц + (3/4 + 23/28) = 7ц + (21/28 + 23/28) = 7ц 46/28 = 8ц 18/28 = 8ц 9/14