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2014-04-02T21:53:38+02:00
Bonsoir

138 -63 = 75
75 -63 = 12
63 -12 = 51
51 -12 = 39
39 -12 = 27
27 -12 = 15
15 -12 = 3
12 -3 = 9
9 -3 = 3
3 -3 = 0
PGCD = 3