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y in (-oo:+oo)
-y/12 < 31/2 // - 31/2
-y/12-(31/2) < 0
-y/12-31/2 < 0
-1/12*y-31/2 < 0 // + 31/2
-1/12*y < 31/2 // : -1/12
y > 31/2/(-1/12)
y > -186
y in (-186:+oo)
(-186:+oo)
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