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d in (-oo:+oo)
d/60 = 40/10 // - 40/10
d/60-(40/10) = 0
d/60-4 = 0
1/60*d-4 = 0 // + 4
1/60*d = 4 // : 1/60
d = 4/1/60
d = 240
d = 240
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