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If 2^(2x-1)+4^x=2^(x-1/2)+2^(x+1/2), the...

If `2^(2x-1)+4^x=2^(x-1/2)+2^(x+1/2)`, then `x` equals
a. `1/2`
b. `2/3`
c. `1`
d. `3/2`

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