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C in (-oo:+oo)
C/7 < 12 // - 12
C/7-12 < 0
1/7*C-12 < 0 // + 12
1/7*C < 12 // : 1/7
C < 12/1/7
C < 84
C in (-oo:84)
(-oo:84)
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