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r in (-oo:+oo)
360 = (2/3)*r // - (2/3)*r
360-((2/3)*r) = 0
(-2/3)*r+360 = 0
360-2/3*r = 0 // - 360
-2/3*r = -360 // : -2/3
r = -360/(-2/3)
r = 540
r = 540
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