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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 (-36:+oo)
(-36:+oo)
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