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c in (-oo:+oo)
(-1/4)*c >= 1 // - 1
(-1/4)*c-1 >= 0
-1/4*c-1 >= 0 // + 1
-1/4*c >= 1 // : -1/4
c <= 1/(-1/4)
c <= -4
c in (-oo:-4>
(-oo:-4>
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