Răspuns :
a=2b
b=c-6
c=d-12
d=3×e
e+d=80
înlocuim d cu 3e
e+3e=80
4e=80
e=20
d=3×20=60
c=60-12=48
b=48-6=42
a=42×2=84
b=c-6
c=d-12
d=3×e
e+d=80
înlocuim d cu 3e
e+3e=80
4e=80
e=20
d=3×20=60
c=60-12=48
b=48-6=42
a=42×2=84
a=2xb
b=c-6
c=d-12
d=ex3
d+e=80
3e+e=80
4e=80
e=20
d=20x3=60
c=60-12=48
b=48-6=42
a=42x2=84
b=c-6
c=d-12
d=ex3
d+e=80
3e+e=80
4e=80
e=20
d=20x3=60
c=60-12=48
b=48-6=42
a=42x2=84