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C in (-oo:+oo)
C/4-4 < -7.2 // + 7.2
C/4-4+7.2 < 0
1/4*C+3.2 < 0 // - 3.2
1/4*C < -3.2 // : 1/4
C < -3.2/1/4
C < -12.8
C in (-oo:-12.8)
(-oo:-12.8)
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