а) 2 1/14 - 1 2/3x = 1 5/21
б)(8/15 + 2/9y) : 3/5 = 2
г) 2/5m+ 3/10m - 2/15m = 1/6
д)z - 8/15z =1/3

а) 2 1/14 - 1 2/3x = 1 5/21 29/14-5/3x=26/21-5/3x=26/21-29/1426/21-29/14=52/42-87/42= -35/42-5/3x= -35/42X= 35/42:5/3X=35/42×3/5X=7/14=1/2б)(8/15 + 2/9y) : 3/5 = 2(8/15 + 2/9y)=2×3/58/15 + 2/9y=6/52/9y=6/5-8/152/9y=18/15-8/152/9y=10/152/9y=2/3Y=2/3:2/9Y=2/3×9/2Y=3г) 2/5m+ 3/10m - 2/15m = 1/62/5+3/10=4/10+3/10=7/107/10-2/15=21/30-4/30=17/3017/30m=1/6m=1/6:17/30m=1/6×30/17m=5/17д)z - 8/15z =1/37/15z=1/3z=1/3:7/15z=1/3×15/7z=5/7