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D in (-oo:+oo)
D/30 = 6/25 // - 6/25
D/30-(6/25) = 0
D/30-6/25 = 0
1/30*D-6/25 = 0 // + 6/25
1/30*D = 6/25 // : 1/30
D = 6/25/1/30
D = 36/5
D = 36/5
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