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c in (-oo:+oo)
-15 > c/(-4) // - c/(-4)
-(c/(-4))-15 > 0
1/4*c-15 > 0 // + 15
1/4*c > 15 // : 1/4
c > 15/1/4
c > 60
c in (60:+oo)
(60:+oo)
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