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x in (-oo:+oo)
8-((1/4)*x) > 20 // - 20
8-((1/4)*x)-20 > 0
(-1/4)*x-20+8 > 0
-1/4*x-12 > 0 // + 12
-1/4*x > 12 // : -1/4
x < 12/(-1/4)
x < -48
x in (-oo:-48)
(-oo:-48)
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