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Cu-65 = x
63,5 =
63,5 =
63,5 x 100 = 6300 - 63x + 65x
6350 = 6300 - 63x + 65x
6350 - 6300 = - 63x + 65x
50 = 2x
25 = x
Cu-63 di alam = 100 - 25 = 75
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