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sabineodf received 1 Kudos for post Re: If 625^(-x) + 25^(-2x) + 5^(-4x) = 15, what is the value of x?.

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BunuelRe: If 625^(-x) + 25^(-2x) + 5^(-4x) = 15, what is the value of x?25-May-2015

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