(2^(-x) + 2^1 * 2^(-x))/3 = 5^(x+2)/5^(2x+2)
2^(-x) * (1+2)/3 = 5^(-x)
2^(-x)/5^(-x) = 3/3
(5/2)^x = 1
(5/2)^x = (5/2)^0
x = 0
@eidosm Grazie!!
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