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D in (-oo:+oo)
-9*(D/4) = -3 // + 3
3-9*(D/4) = 0
3-9/4*D = 0 // - 3
-9/4*D = -3 // : -9/4
D = -3/(-9/4)
D = 4/3
D = 4/3
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