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U6 = a x r^5
U6 = a x r x r^4
U6 = U2 x r^4
64 = 4 x r^4
r^4 = 64 / 4
r^4 = 16
r = 2
lalu tinggal cari a,
U2 = a x r
4 = a x 2
a = 2