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r in (-oo:+oo)
8.22/6.28 = (6.28*r)/6.28 // - (6.28*r)/6.28
8.22/6.28-((6.28*r)/6.28) = 0
8.22/6.28-r = 0
1.3089172-r = 0 // - 1.3089172
-r = -1.3089172 // * -1
r = 1.3089172
r = 1.3089172
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