-x=18.24+(-35.8)

-x= -17.56

x=17.56

-x=4  1/8-1.25

-x=4.125-1.25

-x=2.875

x= -2.875

x= -2  7/8

-y=42.74-56.3

-y= -13.56

y= 13.56

-y=2/3-3/7                 = 14/21-9/21=5/21

-y=5/21

y= -5/21