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c in (-oo:+oo)
c/9 > -6 // + 6
c/9+6 > 0
1/9*c+6 > 0 // - 6
1/9*c > -6 // : 1/9
c > -6/1/9
c > -54
c in (-54:+oo)
(-54:+oo)
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