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c in (-oo:+oo)
c/8 = 6.8 // - 6.8
c/8-6.8 = 0
1/8*c-6.8 = 0 // + 6.8
1/8*c = 6.8 // : 1/8
c = 6.8/1/8
c = 54.4
c = 54.4
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