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stiind ca:4b+6ab+3bc=80si6a+3c=12,atunci beste egal cu:A)5 B)6,C)8,D)4

Răspuns :

dam factor comun pe b
4b+b(6a+3c) = 80
4b+b*12 = 80
16b = 80
b = 80 : 16
b = 5
raspuns corect A) 5