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