Solve for R
R = \frac{13}{7} = 1\frac{6}{7} \approx 1.857142857
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R\times 28=4\times 13
Variable R cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 4R^{3}, the least common multiple of \left(2R\right)^{2},R^{3}.
R\times 28=52
Multiply 4 and 13 to get 52.
R=\frac{52}{28}
Divide both sides by 28.
R=\frac{13}{7}
Reduce the fraction \frac{52}{28} to lowest terms by extracting and canceling out 4.
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