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x in (-oo:+oo)
x/(-18) < 4 // - 4
x/(-18)-4 < 0
-1/18*x-4 < 0 // + 4
-1/18*x < 4 // : -1/18
x > 4/(-1/18)
x > -72
x in (-72:+oo)
(-72:+oo)
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