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c in (-oo:+oo)
(-1/5)*c < 2 // - 2
(-1/5)*c-2 < 0
-1/5*c-2 < 0 // + 2
-1/5*c < 2 // : -1/5
c > 2/(-1/5)
c > -10
c in (-10:+oo)
(-10:+oo)
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