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C in (-oo:+oo)
C/(-3) = 0.3 // - 0.3
C/(-3)-0.3 = 0
-1/3*C-0.3 = 0 // + 0.3
-1/3*C = 0.3 // : -1/3
C = 0.3/(-1/3)
C = -0.90000001
C = -0.90000001
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