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d in (-oo:+oo)
18.5 = d/0.75 // - d/0.75
18.5-(d/0.75) = 0
18.5-1.33333333*d = 0
18.5-1.33333333*d = 0 // - 18.5
-1.33333333*d = -18.5 // : -1.33333333
d = -18.5/(-1.33333333)
d = 13.87500003
d = 13.87500003
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