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b in (-oo:+oo)
(1/5)*b > 1 // - 1
(1/5)*b-1 > 0
1/5*b-1 > 0 // + 1
1/5*b > 1 // : 1/5
b > 1/1/5
b > 5
b in (5:+oo)
(5:+oo)
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