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b in (-oo:+oo)
3*b-(3/5) = b-(2/15) // - b-(2/15)
3*b-b-(3/5)+2/15 = 0
3*b-b-3/5+2/15 = 0
2*b-7/15 = 0 // + 7/15
2*b = 7/15 // : 2
b = 7/15/2
b = 7/30
b = 7/30
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