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B in (-oo:+oo)
B/4 < 3 // - 3
B/4-3 < 0
1/4*B-3 < 0 // + 3
1/4*B < 3 // : 1/4
B < 3/1/4
B < 12
B in (-oo:12)
(-oo:12)
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