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(7+a+7+a+7) *7 + (7+a+7+a+7) *7 +(7+a+7+a+7) *7 =777 rezolvati exercitiul

Răspuns :

49+7a+49+7a+49+49+7a+49+7a+49+49+7a+49+7a+49=777
441+42a=777
42a=777-441
42a=336
a=336/42
a=8