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b in (-oo:+oo)
b/12-6 <= 6 // - 6
b/12-6-6 <= 0
1/12*b-12 <= 0 // + 12
1/12*b <= 12 // : 1/12
b <= 12/1/12
b <= 144
b in (-oo:144>
(-oo:144>
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