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=((1/2)^2)^3x-2 <_ (1/2)^x-5
=6x-4 >_ x-5
=5x>_ -1/5
b) (1/4)^x - (1/2)^x -2 >_0
= (1/2)^2x >_ (1/2)^x+2
= 2x <_ x+2
x<_2