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c in (-oo:+oo)
104 = (9/5)*c+32 // - (9/5)*c+32
104-((9/5)*c)-32 = 0
(-9/5)*c-32+104 = 0
72-9/5*c = 0 // - 72
-9/5*c = -72 // : -9/5
c = -72/(-9/5)
c = 40
c = 40
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