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d in (-oo:+oo)
4/7 = d/28 // - d/28
4/7-(d/28) = 0
4/7-1/28*d = 0 // - 4/7
-1/28*d = -4/7 // : -1/28
d = -4/7/(-1/28)
d = 16
d = 16
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