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x in (-oo:+oo)
-x/10 < 9 // - 9
-x/10-9 < 0
-1/10*x-9 < 0 // + 9
-1/10*x < 9 // : -1/10
x > 9/(-1/10)
x > -90
x in (-90:+oo)
(-90:+oo)
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