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c in (-oo:+oo)
c = (5/9)*(30-32) // - (5/9)*(30-32)
c-((5/9)*(30-32)) = 0
c+(-5/9)*(30-32) = 0
c+10/9 = 0 // - 10/9
c = -10/9
c = -10/9
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