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