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r in (-oo:+oo)
256.36 = 1691*(271/360)*r // - 1691*(271/360)*r
256.36-(1691*(271/360)*r) = 0
(-458261/360)*r+256.36 = 0
256.36-458261/360*r = 0 // - 256.36
-458261/360*r = -256.36 // : -458261/360
r = -256.36/(-458261/360)
r = 0.20139091
r = 0.20139091
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