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x in (-oo:+oo)
(i/256)*x = 0.5-((c/256)*x) // - 0.5-((c/256)*x)
(c/256)*x+(i/256)*x-0.5 = 0
1/256*i*x-0.5 = 0 // + 0.5
1/256*i*x = 0.5 // : 1/256*i
x = 0.5/(1/256*i)
x = 128*i^-1
x = 128*i^-1
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