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3^(3x) = a
jadi :
(3^(3x)²- 2.3^(3x).3^1 - 27 = 0
a² -6a - 27 = 0
(a-9) (a+3) = 0
a = 9 atau a = -3 (gak memenuhi)
3^(3x) = 9
3^(3x) = 3²
3x = 2
x = 2/3
hp = x = 2/3