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D in (-oo:+oo)
D/6 = 4.25 // - 4.25
D/6-4.25 = 0
1/6*D-4.25 = 0 // + 4.25
1/6*D = 4.25 // : 1/6
D = 4.25/1/6
D = 25.49999949
D = 25.49999949
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