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c in (-oo:+oo)
4/12 = c/6 // - c/6
4/12-(c/6) = 0
1/3-1/6*c = 0 // - 1/3
-1/6*c = -1/3 // : -1/6
c = -1/3/(-1/6)
c = 2
c = 2
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