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2^(2x) - 2^(x+1) - 3= 0
(2^x)^2 - (2^x). 2 - 3 = 0
misal
2^x = a --> x = 2'log a dan a > 0
a^2 - 2a -3 = 0
(a - 3)(a+1) = 0
a > 0 --> a = 3
x = 2'log 3