( 6 / 7 х - 1/5 ) × 1/8 = 1/8
6/7 х - 1/5 = 1/8 : 1/8
6/7 х - 1/5 = 1
6/7 х = 1 + 1/5
6/7 х = 6/5
х = 6/5 : 6/7
х = 7/5 = 1 2/5
( 6 / 7 х - 1/5 ) × 1/8 = 1/8
6/7 х - 1/5 = 1/8 : 1/8
6/7 х - 1/5 = 1
6/7 х = 1 + 1/5
6/7 х = 6/5
х = 6/5 : 6/7
х = 7/5 = 1 2/5