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r in (-oo:+oo)
r/2+0.6*r = 247 // - 247
r/2+0.6*r-247 = 0
1.1*r-247 = 0 // + 247
1.1*r = 247 // : 1.1
r = 247/1.1
r = 224.54545455
r = 224.54545455
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