If (2^-1 + 4^-1 +6^-1 +8^-1)^x=1 then the value of x is _____________?
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(2×1-1+4×1-1+6×1-1+8×1-1)
(2-1 +4-1+6-1+8-1)
(1+3+5+7)
16
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