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d in (-oo:+oo)
5/7 = d/56 // - d/56
5/7-(d/56) = 0
5/7-1/56*d = 0 // - 5/7
-1/56*d = -5/7 // : -1/56
d = -5/7/(-1/56)
d = 40
d = 40
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