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