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U1 = a-4
U2 = ax
r = U2/U1 = ax+4 (sifat eksponen)
U8 = a.(r)7
a52 = a-4 (ax+4)7
a52 = a-4 a7x + 28
a52 = a7x + 24
52 = 7x + 24
7x = 28
x = 4