Răspuns :
|-----| primul numar
|-----|-----| al doilea numar
|-----|-----|-----|-----| al treilea numar
7a=63
a=63:7
a=9
b=9x2=18
c=18x2=36
9+18+36=63
|-----|-----| al doilea numar
|-----|-----|-----|-----| al treilea numar
7a=63
a=63:7
a=9
b=9x2=18
c=18x2=36
9+18+36=63