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h in (-oo:+oo)
-12 > h/4 // - h/4
-(h/4)-12 > 0
-1/4*h-12 > 0 // + 12
-1/4*h > 12 // : -1/4
h < 12/(-1/4)
h < -48
h in (-oo:-48)
(-oo:-48)
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