(y+100)-60=140
y+100-60=140
y+40=140
y=140-40
y=100
(y+100)-60=140 y+100-60=140 y+40=140 y=140-40 y=100
(y+100)-60=140
y+100-60=140
y+40=140
y=140-40
y=100
(y+100)-60=140 y+100-60=140 y+40=140 y=140-40 y=100