(8^x - 2^(-x + 1))·(5^(2·x) - 5·√5) = 0
8^x - 2^(-x + 1) = 0
2^(3·x) = 2^(-x + 1)
3·x = -x + 1---> x = 1/4
5^(2·x) - 5·√5 = 0
5^(2·x) = 5^(1 + 1/2)
2·x = 1 + 1/2---> 2·x = 3/2---> x = 3/4
In definitiva: x = 1/4 ∨ x = 3/4
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