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D in (-oo:+oo)
D/3 = 2/25 // - 2/25
D/3-(2/25) = 0
D/3-2/25 = 0
1/3*D-2/25 = 0 // + 2/25
1/3*D = 2/25 // : 1/3
D = 2/25/1/3
D = 6/25
D = 6/25
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