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b in (-oo:+oo)
b/4 < 28 // - 28
b/4-28 < 0
1/4*b-28 < 0 // + 28
1/4*b < 28 // : 1/4
b < 28/1/4
b < 112
b in (-oo:112)
(-oo:112)
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