2. 115 - (35=y) = 39
115-35-y=39
80-y=39
-y=39-80
-y=-41
y=41
3. z-35-64=16
z-99=16
z=16+99
z=115
4. 28-t+35=53
-t=53 - (28+35)
-t=53-63
-t=-10
t=10
2. 115 - (35=y) = 39
115-35-y=39
80-y=39
-y=39-80
-y=-41
y=41
3. z-35-64=16
z-99=16
z=16+99
z=115
4. 28-t+35=53
-t=53 - (28+35)
-t=53-63
-t=-10
t=10