Solve for d
d = \frac{20}{\pi + 1} \approx 4.82906014
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\left(\pi +1\right)d=20
Combine all terms containing d.
\frac{\left(\pi +1\right)d}{\pi +1}=\frac{20}{\pi +1}
Divide both sides by \pi +1.
d=\frac{20}{\pi +1}
Dividing by \pi +1 undoes the multiplication by \pi +1.
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