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stiind ca 7ab-7ac=105 si a=5 calculati b-c

Răspuns :

7a(b-c)=105
7x5(b-c)=105
35(b-c)=105
b-c=105:35
b-c=3

7ax(b-c)=105
7x5x(b-c)105
35x(b-c)=105
b-c=105:35=3