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c in (-oo:+oo)
4*(c-(2/3)) = -18 // + 18
4*(c-(2/3))+18 = 0
4*(c-2/3)+18 = 0
4*(c-2/3)+18 = 0
4*c+46/3 = 0
4*c+46/3 = 0
4*c+46/3 = 0 // - 46/3
4*c = -46/3 // : 4
c = -46/3/4
c = -23/6
c = -23/6
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