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c in (-oo:+oo)
c/1.6 = 0.8/6.4 // - 0.8/6.4
c/1.6-(0.8/6.4) = 0
c/1.6-0.125 = 0
0.625*c-0.125 = 0 // + 0.125
0.625*c = 0.125 // : 0.625
c = 0.125/0.625
c = 0.2
c = 0.2
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