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y in (-oo:+oo)
6 < (-9/7)*y // - (-9/7)*y
6-((-9/7)*y) < 0
(9/7)*y+6 < 0
9/7*y+6 < 0 // - 6
9/7*y < -6 // : 9/7
y < -6/9/7
y < -14/3
y in (-oo:-14/3)
(-oo:-14/3)
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