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c in (-oo:+oo)
(2/3)*(c-1) = 4*(1/2)*c+1 // - 4*(1/2)*c+1
(2/3)*(c-1)-(4*(1/2)*c)-1 = 0
(2/3)*(c-1)-2*c-1 = 0
2/3*(c-1)-2*c-1 = 0
2/3*(c-1)-2*c-1 = 0
-4/3*c-1-2/3 = 0
-4/3*c-5/3 = 0
-4/3*c-5/3 = 0
-4/3*c-5/3 = 0 // + 5/3
-4/3*c = 5/3 // : -4/3
c = 5/3/(-4/3)
c = -5/4
c = -5/4
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