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D in (-oo:+oo)
-D/5-12 > 8 // - 8
-D/5-12-8 > 0
-1/5*D-20 > 0 // + 20
-1/5*D > 20 // : -1/5
D < 20/(-1/5)
D < -100
D in (-oo:-100)
(-oo:-100)
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