Solve for D
D=\frac{1}{7}\approx 0.142857143
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\frac{1}{21}\times 3=D
Multiply both sides by 3, the reciprocal of \frac{1}{3}.
\frac{3}{21}=D
Multiply \frac{1}{21} and 3 to get \frac{3}{21}.
\frac{1}{7}=D
Reduce the fraction \frac{3}{21} to lowest terms by extracting and canceling out 3.
D=\frac{1}{7}
Swap sides so that all variable terms are on the left hand side.
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