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c in (-oo:+oo)
100.94 = (9/5)*c+32 // - (9/5)*c+32
100.94-((9/5)*c)-32 = 0
(-9/5)*c-32+100.94 = 0
68.94-9/5*c = 0 // - 68.94
-9/5*c = -68.94 // : -9/5
c = -68.94/(-9/5)
c = 38.3
c = 38.3
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