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x in (-oo:+oo)
(-7/9)*x < 3 // - 3
(-7/9)*x-3 < 0
-7/9*x-3 < 0 // + 3
-7/9*x < 3 // : -7/9
x > 3/(-7/9)
x > -27/7
x in (-27/7:+oo)
(-27/7:+oo)
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