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b in (-oo:+oo)
(4/5)*b+(1/2)*b+5/6 = 188/15 // - 188/15
(4/5)*b+(1/2)*b+5/6-(188/15) = 0
(4/5)*b+(1/2)*b+5/6-188/15 = 0
13/10*b-117/10 = 0 // + 117/10
13/10*b = 117/10 // : 13/10
b = 117/10/13/10
b = 9
b = 9
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