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