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b in (-oo:+oo)
5*b+(3/4)*b = 85 // - 85
5*b+(3/4)*b-85 = 0
23/4*b-85 = 0 // + 85
23/4*b = 85 // : 23/4
b = 85/23/4
b = 340/23
b = 340/23
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