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Sganjil = ar/(a - r²)
a/(1 - r²) x r = 64
48 x r = 64
r = 4/3
48 = a/(1 - (4/3)²)
48 = a/(1 - 16/9)
48 = a/(- 7/16)
48 = - 16a/7
3 = - a/7
a = - 21