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x in (-oo:+oo)
1/512 = 2^3*x-1 // - 2^3*x-1
1/512-(2^3*x)+1 = 0
513/512-8*x = 0 // - 513/512
-8*x = -513/512 // : -8
x = -513/512/(-8)
x = 513/4096
x = 513/4096
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