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x in (-oo:+oo)
(-1/4)*x-10 < 30 // - 30
(-1/4)*x-30-10 < 0
-1/4*x-40 < 0 // + 40
-1/4*x < 40 // : -1/4
x > 40/(-1/4)
x > -160
x in (-160:+oo)
(-160:+oo)
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