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a+b+c=819. a+b=434 b+c=641 ne poate ajuta cineva.
a+b-c=534
a+b=723
b-c=48

a+b+c=637
a+b=372
b+c=402

a+b+c=750
a+b=372
b+c=528

a+b+c=862
a+b=666
b+c=491