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C in (-oo:+oo)
C = (5/9)*(31-32) // - (5/9)*(31-32)
C-((5/9)*(31-32)) = 0
C+(-5/9)*(31-32) = 0
C+5/9 = 0 // - 5/9
C = -5/9
C = -5/9
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