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Florinapircioai
a fost răspuns

(5×x+1)×5=5+5×{5+5×[5+5×(5+5×5)]}

Răspuns :

25x+5=5+5x[5+5x(5+5x30)]
25x+5=5+5x(5+5x155)
25x+5=5+5x780
25x+5=3905
25x=3905-5
x=3900:25
x=156