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b in (-oo:+oo)
5*b+2*b+1/5 = 109/20 // - 109/20
5*b+2*b+1/5-(109/20) = 0
5*b+2*b+1/5-109/20 = 0
7*b-21/4 = 0 // + 21/4
7*b = 21/4 // : 7
b = 21/4/7
b = 3/4
b = 3/4
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