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b in (-oo:+oo)
5*b-((1/2)*(8-(2*b)))-9 = 0
(-1/2)*(8-2*b)+5*b-9 = 0
5*b-1/2*(8-2*b)-9 = 0
5*b-1/2*(8-2*b)-9 = 0
6*b-9-4 = 0
6*b-13 = 0
6*b-13 = 0
6*b-13 = 0 // + 13
6*b = 13 // : 6
b = 13/6
b = 13/6
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