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c in (-oo:+oo)
c/0.2 = 1.6 // - 1.6
c/0.2-1.6 = 0
5*c-1.6 = 0 // + 1.6
5*c = 1.6 // : 5
c = 1.6/5
c = 0.32
c = 0.32
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