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C in (-oo:+oo)
C/(-3.4) = 20.8 // - 20.8
C/(-3.4)-20.8 = 0
-0.29411765*C-20.8 = 0 // + 20.8
-0.29411765*C = 20.8 // : -0.29411765
C = 20.8/(-0.29411765)
C = -70.71999929
C = -70.71999929
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