Evaluate
\frac{LR}{3}
Differentiate w.r.t. L
\frac{R}{3}
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\frac{LR\times 7}{21}
Divide LR by \frac{21}{7} by multiplying LR by the reciprocal of \frac{21}{7}.
LR\times \frac{1}{3}
Divide LR\times 7 by 21 to get LR\times \frac{1}{3}.
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