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Rezolvati in N ecuatia 2* (x+7)- 14= 28

Răspuns :

[tex]2*(x+7)-14=28 \\ 2x+14-14=28 \\ 2x=28 \\ x=28:2 \\ x=14. \\x\in\mathbb{N}[/tex]
2*(x+7)-14=28..+14
2*(x+7)=42... /2
x+7=21...-7
x=14