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c in (-oo:+oo)
2 > c/3 // - c/3
2-(c/3) > 0
2-1/3*c > 0 // - 2
-1/3*c > -2 // : -1/3
c < -2/(-1/3)
c < 6
c in (-oo:6)
(-oo:6)
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