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r in (-oo:+oo)
r/3.1 = 500 // - 500
r/3.1-500 = 0
0.32258065*r-500 = 0 // + 500
0.32258065*r = 500 // : 0.32258065
r = 500/0.32258065
r = 1549.99997675
r = 1549.99997675
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