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