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y in (-oo:+oo)
(1/6)*(9-y) > 12 // - 12
(1/6)*(9-y)-12 > 0
1/6*(9-y)-12 > 0
1/6*(9-y)-12 > 0
-1/6*y-21/2 > 0
-1/6*y-21/2 > 0
-1/6*y-21/2 > 0 // + 21/2
-1/6*y > 21/2 // : -1/6
y < 21/2/(-1/6)
y < -63
(-oo:-63) (-63:+oo) -1/6*y-21/2 + -
y in (-oo:-63)
(-oo:-63)
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