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x in (-oo:+oo)
(-20/9)*x > 1 // - 1
(-20/9)*x-1 > 0
-20/9*x-1 > 0 // + 1
-20/9*x > 1 // : -20/9
x < 1/(-20/9)
x < -9/20
x in (-oo:-9/20)
(-oo:-9/20)
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