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C in (-oo:+oo)
C/0.3 = -5.1 // + 5.1
C/0.3+5.1 = 0
3.33333333*C+5.1 = 0 // - 5.1
3.33333333*C = -5.1 // : 3.33333333
C = -5.1/3.33333333
C = -1.53
C = -1.53
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