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7ab-7ac=105 a=5 aflati b-c

Răspuns :

7a(b-c)=105
a(b-c)=15
5(b-c)=15
b-c=3
7ab-7ac=105 a=57ab-7ac= 7( ab-ac)=105ab-ac=105/7
ab-ac=15
a=5
5b-5c=15
5(b-c)=15
b-c= 15:5
b-c=3