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x in (-oo:+oo)
5-(x/3) > 8 // - 8
5-(x/3)-8 > 0
-1/3*x-3 > 0 // + 3
-1/3*x > 3 // : -1/3
x < 3/(-1/3)
x < -9
x in (-oo:-9)
(-oo:-9)
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