Răspuns:
b=312
a+b+c=693
a+b=587
Din acestea doua calcule rezulta
587+c=693
c=693-587
c=106
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a+b+c=693
b+c=418
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a+418=693
a=693-418
a=275
___________________________________________________________
a+b=587
a=275
__________________________________________________________
275+b=587
b=587-275
275+b=587
b=587-275
b=312
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