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x in (-oo:+oo)
(-2/7)*x-6 > 9 // - 9
(-2/7)*x-9-6 > 0
-2/7*x-15 > 0 // + 15
-2/7*x > 15 // : -2/7
x < 15/(-2/7)
x < -105/2
x in (-oo:-105/2)
(-oo:-105/2)
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