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b in (-oo:+oo)
2*b+(11*b)/5 = 21/4 // - 21/4
2*b+(11*b)/5-(21/4) = 0
2*b+(11*b)/5-21/4 = 0
21/5*b-21/4 = 0 // + 21/4
21/5*b = 21/4 // : 21/5
b = 21/4/21/5
b = 5/4
b = 5/4
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