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C in (-oo:+oo)
C/2 > -3 // + 3
C/2+3 > 0
1/2*C+3 > 0 // - 3
1/2*C > -3 // : 1/2
C > -3/1/2
C > -6
C in (-6:+oo)
(-6:+oo)
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