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r in (-oo:+oo)
416.71688 = 2974*(226/360)*r // - 2974*(226/360)*r
416.71688-(2974*(226/360)*r) = 0
(-168031/90)*r+416.71688 = 0
416.71688-168031/90*r = 0 // - 416.71688
-168031/90*r = -416.71688 // : -168031/90
r = -416.71688/(-168031/90)
r = 0.2232
r = 0.2232
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