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b in (-oo:+oo)
5*b+10 = 55/4 // - 55/4
5*b-(55/4)+10 = 0
5*b-55/4+10 = 0
5*b-15/4 = 0 // + 15/4
5*b = 15/4 // : 5
b = 15/4/5
b = 3/4
b = 3/4
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