Ответ:

18/30 - x = 4/30 + 6/30

18/30 - x = 10/30

x = 18/30 - 10/30

x = 8/30

(13/67 + 6/67) - x = 9/67

19/67 - x = 9/67

x = 19/67 - 9/67

x = 10/67

10/15 + (5/15 - x) =14/15

5/15 - x = 14/15 - 10/15

5/15 - x = 4/15

x = 5/15 - 4/15

x = 1/15

34/60 + 8/60 + y = 41/60 + 16/60

42/60 + y = 57/60

y = 57/60 - 42/60

y = 15/60

64/70 - (x + 26/70) = 5/70

x + 26/70 = 64/70 - 5/70

x + 26/70 = 59/70

x = 59/70 - 26/70

x = 33/70

x + 27/46 = 35/46 +2/46

x +27/46 = 37/46

x = 37/46 - 27/46

x = 10/46