72/80 - (x - 12/80) = 15/80
72/80 - x + 12/80 = 15/80
- x = 15/80 - 72/80 - 12/80
- x = -69/80
x = 69/80
x + 7/50 = 3/50 + 27/50
x = 3/50 + 27/50 - 7/50
x = 23/50
116/125 - (41/125 + x) = 24/125
116/125 - 41/125 - x = 24/125
- x = 24/125 - 116/125 + 41/125
- x = - 51/125
x = 51/125
4/40 + y + 16/40 = 31/40 + 6/40
y = 31/40 + 6/40 - 4/40 - 16/40
y = 17/40
72/80 - (x - 12/80) = 15/80
72/80 - x + 12/80 = 15/80
- x = 15/80 - 72/80 - 12/80
- x = -69/80
x = 69/80
x + 7/50 = 3/50 + 27/50
x = 3/50 + 27/50 - 7/50
x = 23/50
116/125 - (41/125 + x) = 24/125
116/125 - 41/125 - x = 24/125
- x = 24/125 - 116/125 + 41/125
- x = - 51/125
x = 51/125
4/40 + y + 16/40 = 31/40 + 6/40
y = 31/40 + 6/40 - 4/40 - 16/40
y = 17/40