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x in (-oo:+oo)
(-2/3)*x > 12 // - 12
(-2/3)*x-12 > 0
-2/3*x-12 > 0 // + 12
-2/3*x > 12 // : -2/3
x < 12/(-2/3)
x < -18
x in (-oo:-18)
(-oo:-18)
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