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Daria04082005
a fost răspuns

a+b+c=122
(a+b):c=4 rest 7
b=18+c
----------------------
a=?

Răspuns :

a+b=4c+7
b=18+c
4c+7+c=122=>5c=122-7=>c=115:5=>c=23
b=18+23=>b=41
a=122-(23+41)=>a=58