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c in (-oo:+oo)
8/6 = c/30 // - c/30
8/6-(c/30) = 0
4/3-1/30*c = 0 // - 4/3
-1/30*c = -4/3 // : -1/30
c = -4/3/(-1/30)
c = 40
c = 40
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