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c in (-oo:+oo)
4/5 = c/15 // - c/15
4/5-(c/15) = 0
4/5-1/15*c = 0 // - 4/5
-1/15*c = -4/5 // : -1/15
c = -4/5/(-1/15)
c = 12
c = 12
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