x+(-0.35)=2.3
x-0.35 =2.3

x=2.65

-23.5+(-y)=-4.6

-23.5-y=-4.6

-y=-4.6+23.5

-y=18.9

y=-18.9

y+(-48.3)=-78.5

y-48.3=-78.5

y=-78.5+48.3=-30.2