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If `10^(x-1) + 10^(-x-1) = (1)/(3)`, then x equals to

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If `10^(x-1) + 10^(-x-1) = (1)/(3)`, then x equals to
A. `+-"log"_(10)3`
B. `2"log"_(3)10`
C. `"log"_(3)3`
D. `"log"_(2) 10`
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Correct Answer - A
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