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4^x-2^(x+1)-8=0 (2^2)^x-2*2^x-8=0 (2^x)^2-2*2^x-8=0 (2^x-4)(2^x+2)=0 Because 2 ^ x + 2 > 0 SO 2 ^ x-4 = 0 2^x=4 x=2
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