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C in (-oo:+oo)
185 = (9/5)*C+32 // - (9/5)*C+32
185-((9/5)*C)-32 = 0
(-9/5)*C-32+185 = 0
153-9/5*C = 0 // - 153
-9/5*C = -153 // : -9/5
C = -153/(-9/5)
C = 85
C = 85
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