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D in (-oo:+oo)
3*D+4*D = 3/5-D // - 3/5-D
3*D+4*D+D-(3/5) = 0
3*D+4*D+D-3/5 = 0
8*D-3/5 = 0 // + 3/5
8*D = 3/5 // : 8
D = 3/5/8
D = 3/40
D = 3/40
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