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c in (-oo:+oo)
c-(11/14) > -21/2 // + -21/2
c-(11/14)-(-21/2) > 0
c-11/14+21/2 > 0
c+68/7 > 0 // - 68/7
c > -68/7
c in (-68/7:+oo)
(-68/7:+oo)
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