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x in (-oo:+oo)
(-1/6)*x > 12 // - 12
(-1/6)*x-12 > 0
-1/6*x-12 > 0 // + 12
-1/6*x > 12 // : -1/6
x < 12/(-1/6)
x < -72
x in (-oo:-72)
(-oo:-72)
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