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c in (-oo:+oo)
c/6 = 2.5 // - 2.5
c/6-2.5 = 0
1/6*c-2.5 = 0 // + 2.5
1/6*c = 2.5 // : 1/6
c = 2.5/1/6
c = 14.9999997
c = 14.9999997
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