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r in (-oo:+oo)
(1/5)*r = 2.33 // - 2.33
(1/5)*r-2.33 = 0
1/5*r-2.33 = 0 // + 2.33
1/5*r = 2.33 // : 1/5
r = 2.33/1/5
r = 11.65
r = 11.65
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