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r in (-oo:+oo)
r-3.91 = 40*(-1/200) // - 40*(-1/200)
r-(40*(-1/200))-3.91 = 0
r+1/5-3.91 = 0
r-3.71 = 0 // + 3.71
r = 3.71
r = 3.71
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