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