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c in (-oo:+oo)
2*(c+0.5) = 12/3 // - 12/3
2*(c+0.5)-(12/3) = 0
2*(c+0.5)-4 = 0
2*(c+0.5)-4 = 0
2*c-3 = 0
2*c-3 = 0
2*c-3 = 0 // + 3
2*c = 3 // : 2
c = 3/2
c = 3/2
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