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x in (-oo:+oo)
x/(-4) < 5 // - 5
x/(-4)-5 < 0
-1/4*x-5 < 0 // + 5
-1/4*x < 5 // : -1/4
x > 5/(-1/4)
x > -20
x in (-20:+oo)
(-20:+oo)
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