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A+B+C=755 a+b=513 b+c=354

Răspuns :

c=755-513=242
a=755-354=401
b=354-c=354-242=112
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Verificare: 242+401+112=755 OK
a+b+c=755
a+b=513 + b+c=354
A+2b+c=867 minus A+b+c=755
b=112
b+c=354
c=242
A+b=513
A=401