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D in (-oo:+oo)
1.2 = D/60 // - D/60
1.2-(D/60) = 0
1.2-1/60*D = 0 // - 1.2
-1/60*D = -1.2 // : -1/60
D = -1.2/(-1/60)
D = 71.9999856
D = 71.9999856
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