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C in (-oo:+oo)
23 = (9/5)*C+32 // - (9/5)*C+32
23-((9/5)*C)-32 = 0
(-9/5)*C-32+23 = 0
-9/5*C-9 = 0 // + 9
-9/5*C = 9 // : -9/5
C = 9/(-9/5)
C = -5
C = -5
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