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d in (-oo:+oo)
d/60-1 = d/40 // - d/40
d/60-(d/40)-1 = 0
-1/120*d-1 = 0 // + 1
-1/120*d = 1 // : -1/120
d = 1/(-1/120)
d = -120
d = -120
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