a )3 целых  2/15 x +1 целая  7/10 x =9 целых 2/3
б) (x- 3/8 x ) * 2 целые 4/5 - 1 целая 3/14 = 2 целые 2/7 

3 2/15 x +1 7/10 x =9 2/347/15x + 17/10x = 29/394/30x + 51/30x = 290/30145/30x = 290/30x = 290/30:145/30x=290/30*30/145 x=2(x- 3/8 x ) * 2 4/5 - 1 3/14 = 2 2/7 5/8x* 14/5 - 17/14 = 16/77/4x = 16/7 + 17/147/4x = 32/14+17/147/4x = 49/14x = 49/14:7/4=49/14*4/7=2