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x in (-oo:+oo)
x/(-3) < 3 // - 3
x/(-3)-3 < 0
-1/3*x-3 < 0 // + 3
-1/3*x < 3 // : -1/3
x > 3/(-1/3)
x > -9
x in (-9:+oo)
(-9:+oo)
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