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r in (-oo:+oo)
120 = (9/5)*r-460 // - (9/5)*r-460
120-((9/5)*r)+460 = 0
(-9/5)*r+120+460 = 0
580-9/5*r = 0 // - 580
-9/5*r = -580 // : -9/5
r = -580/(-9/5)
r = 2900/9
r = 2900/9
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