1) 3 2/5 - 4х = 1 7/12
-4х = 1 7/12 - 3 2/5
-4х = -109/60 = -1 49/60
х = 109/240
ответ: х = 109/240
2) 5 8/15 - 2 1/4у = 39/60
-2 1/4у = 39/60 - 5 8/15
-2 1/4у = -293/60
у = 293/135 = 2 23/135
ответ: у = 2 23/135
3) у - 2 5/7у = 3/14
-12/7у = 3/14
у = -1/8
ответ: у = -1/8
4) 2/15х + 2/7 = 32/2х - 11/35
2/15х - 32/2х = -11/35 - 2/7
-238/15х = -3/5
х = 9/238
ответ: х = 9/238