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Sobre a existência de solução para equações 39

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United States 14
Germany 9
China 8
Ukraine 4
Belarus 1
France 1
Russia 1
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Jacksonville 5
Des Moines 4
Ashburn 2
Hebei 2
Kunming 2
Cambridge 1
Dearborn 1
Hanoi 1
Minsk 1
Mountain View 1