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r in (-oo:+oo)
r-3.91 = 60*(-1/200) // - 60*(-1/200)
r-(60*(-1/200))-3.91 = 0
r+3/10-3.91 = 0
r-3.61 = 0 // + 3.61
r = 3.61
r = 3.61
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