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S17 = 0 --> 17/2 (2a+16b) = 0
17a+136b = 0
eleminasi
a+5b = 21 (x136) --> 136a+680b = 2856
17a+136b = 0 (x5) -> 85a+680b = 0 _
51a = 2856
a = 56
jadi, suku pertamanya adlh 56 (A)