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y in (-oo:+oo)
(-1/4)*y > -6 // + 6
(-1/4)*y+6 > 0
6-1/4*y > 0 // - 6
-1/4*y > -6 // : -1/4
y < -6/(-1/4)
y < 24
y in (-oo:24)
(-oo:24)
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