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c in (-oo:+oo)
c/8 = 2.2 // - 2.2
c/8-2.2 = 0
1/8*c-2.2 = 0 // + 2.2
1/8*c = 2.2 // : 1/8
c = 2.2/1/8
c = 17.6
c = 17.6
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