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x in (-oo:+oo)
(-2/3)*x-9 < 9/10 // - 9/10
(-2/3)*x-(9/10)-9 < 0
(-2/3)*x-9/10-9 < 0
-2/3*x-99/10 < 0 // + 99/10
-2/3*x < 99/10 // : -2/3
x > 99/10/(-2/3)
x > -297/20
x in (-297/20:+oo)
(-297/20:+oo)
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