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c in (-oo:+oo)
6*c-(4/8) = 7 // - 7
6*c-(4/8)-7 = 0
6*c-1/2-7 = 0
6*c-15/2 = 0 // + 15/2
6*c = 15/2 // : 6
c = 15/2/6
c = 5/4
c = 5/4
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