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r in (-oo:+oo)
-31 = (5/9)*r-273 // - (5/9)*r-273
273-((5/9)*r)-31 = 0
(-5/9)*r-31+273 = 0
242-5/9*r = 0 // - 242
-5/9*r = -242 // : -5/9
r = -242/(-5/9)
r = 2178/5
r = 2178/5
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