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y in (-oo:+oo)
(-1/3)*y-4 > -7 // + 7
(-1/3)*y-4+7 > 0
3-1/3*y > 0 // - 3
-1/3*y > -3 // : -1/3
y < -3/(-1/3)
y < 9
y in (-oo:9)
(-oo:9)
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