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Va rog frumos problema 10 si 14 urgent

Va Rog Frumos Problema 10 Si 14 Urgent class=

Răspuns :

x-x/6=5x/6
5x/6-5x/6×2/3=5x/18
5x/18-1/3 × 5x/18=90
5x/18-5x/54=90
15x-5x=4860
10x=4860
x=486