4 x 1 0.5 3 2x 1 8 x


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4^x-1*(0.5)^3-2x=(1/8)^x

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4^(x-1)  * (0.5)^(3-2x)=(1/8)^x
2^2(x-1)  *   2^(-(3-2x))   =   2^-3x
 2^(2x-2-3+2x)  = 2^(-3x)
2^(4x-5)=2^(-3x)
4x-5=-3x
7x=5
x=5/7


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