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c in (-oo:+oo)
4.2 = c/8 // - c/8
4.2-(c/8) = 0
4.2-1/8*c = 0 // - 4.2
-1/8*c = -4.2 // : -1/8
c = -4.2/(-1/8)
c = 33.6
c = 33.6
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