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C in (-oo:+oo)
C = (5/9)*(-32-20) // - (5/9)*(-32-20)
C-((5/9)*(-32-20)) = 0
C+(-5/9)*(-32-20) = 0
C+260/9 = 0 // - 260/9
C = -260/9
C = -260/9
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