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x in (-oo:+oo)
x/8-(x/4) > 3 // - 3
x/8-(x/4)-3 > 0
-1/8*x-3 > 0 // + 3
-1/8*x > 3 // : -1/8
x < 3/(-1/8)
x < -24
x in (-oo:-24)
(-oo:-24)
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