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2 ^ x-3 / 2x = 128, find 3-x of X 2x, and the result is - 3 / 13 ok
2^{(x-3)/2x} = 128
2^{(x-3)/2x} = 2^7
（x-3)/2x=7
x-3=14x
13x=-3
x=-3/13
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