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y in (-oo:+oo)
(-3/4)*y < 12 // - 12
(-3/4)*y-12 < 0
-3/4*y-12 < 0 // + 12
-3/4*y < 12 // : -3/4
y > 12/(-3/4)
y > -16
y in (-16:+oo)
(-16:+oo)
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