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Cum se rezolva ecuaţia: x-8/21=5/7​ ,vă rog daca ştiţi explicati pas cu pas

Răspuns :

[tex]x - \frac{8}{21} = \frac{5}{7} \\ \\ x - \frac{8}{21} + \frac{8}{21} = \frac{5}{7} + \frac{8}{21} \\ \\ x = \frac{5 \times 3}{7 \times 3} + \frac{8}{21} \\ \\ x = \frac{15}{21} + \frac{8}{21} \\ \\ x = \frac{23}{21} [/tex]