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b in (-oo:+oo)
6-((8*b)/4) >= -4 // + 4
4-((8*b)/4)+6 >= 0
4-2*b+6 >= 0
10-2*b >= 0 // - 10
-2*b >= -10 // : -2
b <= -10/(-2)
b <= 5
b in (-oo:5>
(-oo:5>
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