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x in (-oo:+oo)
-x/4 > 0.1 // - 0.1
-x/4-0.1 > 0
-1/4*x-0.1 > 0 // + 0.1
-1/4*x > 0.1 // : -1/4
x < 0.1/(-1/4)
x < -0.4
x in (-oo:-0.4)
(-oo:-0.4)
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