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c in (-oo:+oo)
7*c-(2/3) = 1/3 // - 1/3
7*c-(2/3)-(1/3) = 0
7*c-2/3-1/3 = 0
7*c-1 = 0 // + 1
7*c = 1 // : 7
c = 1/7
c = 1/7
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