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C in (-oo:+oo)
C/3.1-C = 12 // - 12
C/3.1-C-12 = 0
-0.67741935*C-12 = 0 // + 12
-0.67741935*C = 12 // : -0.67741935
C = 12/(-0.67741935)
C = -17.71428584
C = -17.71428584
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