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c in (-oo:+oo)
2-(c/2) = c/9+1/6 // - c/9+1/6
2-(c/2)-(c/9)-(1/6) = 0
2-(c/2)-(c/9)-1/6 = 0
11/6-11/18*c = 0 // - 11/6
-11/18*c = -11/6 // : -11/18
c = -11/6/(-11/18)
c = 3
c = 3
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