Question: Problem with plot

Hello

I want to plot in semilog graph the attached function.where b from 1 to 5 and R from 1 to 100000(in logR)I tried with the plot builder but i think i am doing smthing wrong

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R = 2*b*(b^2-9*b-6)/(10*b^3+21*b^2+16*b+4)

(1)
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Download re.mw

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