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aflati nr nat x stiind ca:2 x (x+7)-14=28.

Răspuns :

2x+14-14=28
2x=28
x=28:2
x=14
[tex]2*(x+7)=28+14\\ 2x+14=42\\ 2x=42-14\\ 2x=28\\ x=28:2\\ x=14[/tex]