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b in (-oo:+oo)
b/2-6 > -8 // + 8
b/2-6+8 > 0
1/2*b+2 > 0 // - 2
1/2*b > -2 // : 1/2
b > -2/1/2
b > -4
b in (-4:+oo)
(-4:+oo)
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