Solve for a
a=2\left(\pi -1\right)\approx 4.283185307
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40\pi =20a+40
Use the distributive property to multiply 20 by a+2.
20a+40=40\pi
Swap sides so that all variable terms are on the left hand side.
20a=40\pi -40
Subtract 40 from both sides.
\frac{20a}{20}=\frac{40\pi -40}{20}
Divide both sides by 20.
a=\frac{40\pi -40}{20}
Dividing by 20 undoes the multiplication by 20.
a=2\pi -2
Divide 40\pi -40 by 20.
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