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32=1 2 4 8 16 32 232= 1 2 4 8 29 58 116 232 greatest commen factor=8
A = 2C - 84; A + C = 90 so 2C - 84 + C = 90 ie 3C = 174 so C = 58, its complement (A) is 32. (2 x 58 = 116, 116 - 32 = 84.) Shazam!.
39°54′50″N 116°23′30″E
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1, 2, 4, 8, 16, 29, 32, 58, 116, 232, 464, 928.