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the number of roots of the equation 2x+2x−1+2x−2=7x+7x−1+7x−22^x+2^{x-1}+2^{x-2}= 7^x+7^{x-1}+7^{x-2}2x+2x−1+2x−2=7x+7x−1+7x−2 is
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