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Daca a €N si 4a + 7 € {26,38,43}

Răspuns :

4a+7=26
4a=26-7=19
a=19/4 care nu apartine lui N

4a+7=38
4a=38-7=31
a=31/4 nu apartine lui N

4a+7=43
4a=43-7=36
a=36/4=9

a=9