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