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Răspuns :

2·{2+2·[2+2·(6-2·x)]=28
2+2·[2+2·(6-2·x)]=28÷2
2+2·[2+2·(6-2·x)]=14
2·[2+2·(6-2·x)]=14-2
2·[2+2·(6-2·x)]=12
2+2·(6-2·x)=12÷2
2+2·(6-2·x)=6
2·(6-2·x)=6-2
2·(6-2·x)=4
6-2·x=4÷2
6-2·x=2⇒2·x=6-2⇒2·x=4⇒x=4÷2⇒x=2