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c in (-oo:+oo)
(1/2)^6*c-12 < 2^10*c // - 2^10*c
(1/2)^6*c-(2^10*c)-12 < 0
-65535/64*c-12 < 0 // + 12
-65535/64*c < 12 // : -65535/64
c > 12/(-65535/64)
c > -256/21845
c in (-256/21845:+oo)
(-256/21845:+oo)
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