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x in (-oo:+oo)
-9 < x/4 // - x/4
-(x/4)-9 < 0
-1/4*x-9 < 0 // + 9
-1/4*x < 9 // : -1/4
x > 9/(-1/4)
x > -36
x in (-36:+oo)
(-36:+oo)
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