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c in (-oo:+oo)
2*c-(8*c)-(6/3)+12/6 = 1/5 // - 1/5
2*c-(8*c)-(6/3)+12/6-(1/5) = 0
2*c-8*c+12/6-1/5-2 = 0
-6*c-1/5 = 0 // + 1/5
-6*c = 1/5 // : -6
c = 1/5/(-6)
c = -1/30
c = -1/30
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