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c in (-oo:+oo)
c/6-0.2 = 0.8 // - 0.8
c/6-0.8-0.2 = 0
1/6*c-1 = 0 // + 1
1/6*c = 1 // : 1/6
c = 1/1/6
c = 6
c = 6
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