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16^2x=2^2x-1 .4^2x-1. 8^x
2^4(2x)=2^2x-1. 2^2(2x-1).2^3(x)
2^8x=2^(2x-1+4x-2+3x)
2^8x=2^9x-3
8x=9x-3
8x-9x=-3
-x=-3
x=3