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D in (-oo:+oo)
D/18 = 20/9 // - 20/9
D/18-(20/9) = 0
D/18-20/9 = 0
1/18*D-20/9 = 0 // + 20/9
1/18*D = 20/9 // : 1/18
D = 20/9/1/18
D = 40
D = 40
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