2^(2·x) - 2^(x + 3) + 2^4 > 0
2^(2·x) - 8·2^x + 2^4 > 0
2^x = t
t^2 - 8·t + 16 > 0
(t - 4)^2 > 0
t ≠ 4
2^x ≠ 2^2
x ≠ 2
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