c= nr copiilor
b=5(c-2)
b=4c+17
5(c-2)=4c+17
5c-10=4c+17
5c-4c=17+10
c=27 (copii)
b=5(27-2)=5·25
b=125 (bomboane)
sau b=4·27+17=108+17=125
verificare: (27-2)copii· 5 bomboane=25·5=125 bomboane
4bomboane·27copii+17bomboane=108+17=125 bomboane