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x in (-oo:+oo)
-30 > (1/10)*x-27 // - (1/10)*x-27
27-((1/10)*x)-30 > 0
(-1/10)*x-30+27 > 0
-1/10*x-3 > 0 // + 3
-1/10*x > 3 // : -1/10
x < 3/(-1/10)
x < -30
x in (-oo:-30)
(-oo:-30)
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