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b in (-oo:+oo)
3*b = (5/1)/2 // - (5/1)/2
3*b-((5/1)/2) = 0
3*b-5/2 = 0
3*b-5/2 = 0 // + 5/2
3*b = 5/2 // : 3
b = 5/2/3
b = 5/6
b = 5/6
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