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F in (-oo:+oo)
F = (9/5)*(240-273.15)+32 // - (9/5)*(240-273.15)+32
F-((9/5)*(240-273.15))-32 = 0
F+(-9/5)*(240-273.15)-32 = 0
F+27.67 = 0 // - 27.67
F = -27.67
F = -27.67
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