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D in (-oo:+oo)
D/8 = -20.4 // + 20.4
D/8+20.4 = 0
1/8*D+20.4 = 0 // - 20.4
1/8*D = -20.4 // : 1/8
D = -20.4/1/8
D = -163.2
D = -163.2
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