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d in (-oo:+oo)
3.5 = d/60 // - d/60
3.5-(d/60) = 0
3.5-1/60*d = 0 // - 3.5
-1/60*d = -3.5 // : -1/60
d = -3.5/(-1/60)
d = 209.999958
d = 209.999958
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