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f in (-oo:+oo)
f = (9/5)*(191.8-273.15)-32 // - (9/5)*(191.8-273.15)-32
f-((9/5)*(191.8-273.15))+32 = 0
f+(-9/5)*(191.8-273.15)+32 = 0
f+178.43 = 0 // - 178.43
f = -178.43
f = -178.43
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