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D in (-oo:+oo)
(D-2)/3 = 7 // - 7
(D-2)/3-7 = 0
(D-2)/3+(-7*3)/3 = 0
D-7*3-2 = 0
D-23 = 0
(D-23)/3 = 0
(D-23)/3 = 0 // * 3
D-23 = 0
D-23 = 0 // + 23
D = 23
D = 23
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