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y in (-oo:+oo)
-6 > (-2/3)*y // - (-2/3)*y
-((-2/3)*y)-6 > 0
(2/3)*y-6 > 0
2/3*y-6 > 0 // + 6
2/3*y > 6 // : 2/3
y > 6/2/3
y > 9
y in (9:+oo)
(9:+oo)
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