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x in (-oo:+oo)
6 < x/(-2) // - x/(-2)
6-(x/(-2)) < 0
1/2*x+6 < 0 // - 6
1/2*x < -6 // : 1/2
x < -6/1/2
x < -12
x in (-oo:-12)
(-oo:-12)
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