Răspuns :
a+b+c=28
a=? ; b=12 ; c=12+2 (14)
a+12+14=28|-14 (14)
=a+12=14|-12 (2)
=a=2
2+12+14=
=2+26=
=28
a=? ; b=12 ; c=12+2 (14)
a+12+14=28|-14 (14)
=a+12=14|-12 (2)
=a=2
2+12+14=
=2+26=
=28