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afla numarul necunoscut [26+(x-7)×12]:2=49

Răspuns :

[26+(x-7)x12]=49x2
26+(x-7)x12= 98
(x-7)x12=98-26
(c-7)x12=72
c-7=72:12
c-7=6
c=6+7
c=13