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c in (-oo:+oo)
-4 = c/5-1 // - c/5-1
1-(c/5)-4 = 0
-1/5*c-3 = 0 // + 3
-1/5*c = 3 // : -1/5
c = 3/(-1/5)
c = -15
c = -15
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