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c in (-oo:+oo)
c = (5/9)*(59-39) // - (5/9)*(59-39)
c-((5/9)*(59-39)) = 0
c+(-5/9)*(59-39) = 0
c-100/9 = 0 // + 100/9
c = 100/9
c = 100/9
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