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r in (-oo:+oo)
r/60 = 40/50 // - 40/50
r/60-(40/50) = 0
r/60-4/5 = 0
1/60*r-4/5 = 0 // + 4/5
1/60*r = 4/5 // : 1/60
r = 4/5/1/60
r = 48
r = 48
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