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31=7X-11,AJUTATIMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Răspuns :

31+11=7x
42=7x
x=42:7
x=6
31=7x-11
putem sa scrim ecuatia invers asa 7x-11=31 
7x+31=11
7x=42
x=42:7
x=6   S{6}