Răspuns:
x- descazut
x-60=20
x= 20+60
x=80
proba
80-60=20
x-60=40
x=40+60
x=100
x-60=80
x=80+60
x=140
x-30=20
x=20+30
x=50
x-30=40
x=40+30
x=70
x-30=80
x=80+30
x=110
x-20=20
x=20+20
x=40
x-20=40
x=40+20
x=60
x-20=80
x=80+20
