Solve for a
a=36
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12=\frac{1}{3}a
Cancel out \pi on both sides.
12\times 3=a
Multiply both sides by 3, the reciprocal of \frac{1}{3}.
36=a
Multiply 12 and 3 to get 36.
a=36
Swap sides so that all variable terms are on the left hand side.
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