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b in (-oo:+oo)
167/35 = (4/7)*b-((4/5)*b)+5 // - (4/7)*b-((4/5)*b)+5
(4/5)*b-((4/7)*b)+167/35-5 = 0
(-4/7)*b+(4/5)*b+167/35-5 = 0
8/35*b-8/35 = 0 // + 8/35
8/35*b = 8/35 // : 8/35
b = 8/35/8/35
b = 1
b = 1
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