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b in (-oo:+oo)
(3/5)*b-(1/10) = 7/20-((7/10)*b) // - 7/20-((7/10)*b)
(3/5)*b+(7/10)*b-(1/10)-(7/20) = 0
(3/5)*b+(7/10)*b-1/10-7/20 = 0
13/10*b-9/20 = 0 // + 9/20
13/10*b = 9/20 // : 13/10
b = 9/20/13/10
b = 9/26
b = 9/26
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