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B in (-oo:+oo)
B/8 > -1/5 // + -1/5
B/8-(-1/5) > 0
B/8+1/5 > 0
1/8*B+1/5 > 0 // - 1/5
1/8*B > -1/5 // : 1/8
B > -1/5/1/8
B > -8/5
B in (-8/5:+oo)
(-8/5:+oo)
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