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D in (-oo:+oo)
D/7 = 4/3 // - 4/3
D/7-(4/3) = 0
D/7-4/3 = 0
1/7*D-4/3 = 0 // + 4/3
1/7*D = 4/3 // : 1/7
D = 4/3/1/7
D = 28/3
D = 28/3
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