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b in (-oo:+oo)
b/10-(3/5) > -1/2 // + -1/2
b/10-(3/5)-(-1/2) > 0
b/10-3/5+1/2 > 0
1/10*b-1/10 > 0 // + 1/10
1/10*b > 1/10 // : 1/10
b > 1/10/1/10
b > 1
b in (1:+oo)
(1:+oo)
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