Solve for d
d = \frac{28}{\pi} \approx 8.912676813
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\pi d=28
Swap sides so that all variable terms are on the left hand side.
\frac{\pi d}{\pi }=\frac{28}{\pi }
Divide both sides by \pi .
d=\frac{28}{\pi }
Dividing by \pi undoes the multiplication by \pi .
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