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c in (-oo:+oo)
30/50 = c/5 // - c/5
30/50-(c/5) = 0
3/5-1/5*c = 0 // - 3/5
-1/5*c = -3/5 // : -1/5
c = -3/5/(-1/5)
c = 3
c = 3
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