5^(2·x) + 4·25^x = 5^(1/4)
5^(2·x) + 4·5^(2·x) = 5^(1/4)
5·5^(2·x) = 5^(1/4)
5^(2·x + 1) = 5^(1/4)
2·x + 1 = 1/4
x = - 3/8
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