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y in (-oo:+oo)
-y/3 > 12 // - 12
-y/3-12 > 0
-1/3*y-12 > 0 // + 12
-1/3*y > 12 // : -1/3
y < 12/(-1/3)
y < -36
y in (-oo:-36)
(-oo:-36)
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