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C in (-oo:+oo)
4 = (9/5)*C+32 // - (9/5)*C+32
4-((9/5)*C)-32 = 0
(-9/5)*C-32+4 = 0
-9/5*C-28 = 0 // + 28
-9/5*C = 28 // : -9/5
C = 28/(-9/5)
C = -140/9
C = -140/9
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