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Alcatuiti 5 ecuatii in multimea N si rezolvati-le

Răspuns :

x+3 = 10 => x = 7
x+7 = 15 => x = 8
x*5 = 60 => x = 12
x/5 = 50 => x = 250
x-5 = 10 => x = 15