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calculati 2x+1EGAL CU  13

Răspuns :

[tex]2x+1=13|-1 \\ 2x=12|:2 \\ \boxed{x=6}[/tex]
[tex]2x+1=13 \\ 2x= 13-1 (metoda \ mersului \ invers ) \\ 2x=12 /2 \\ \boxed{x=6}[/tex]