1/6-х=-4/18
-5/12-х=1/6
-4/5+х=5/6

1) 1/6 - x = -4/18     x = 1/6 + 4/18 = 3/18 + 4/18 = 7/182) -5/12 - x =1/6    x = -5/12 - 1/6 = -5/12 - 2/12 = -7/123) -4/5 + x = 5/6     x = 5/6 + 4/5 = 25/30 + 24/30 = 49/30 = 1 19/30