Evaluate
\frac{3I_{7}MR}{20}
Differentiate w.r.t. R
\frac{3I_{7}M}{20}
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\frac{6RMI_{7}}{40}
Multiply 24 and 0.25 to get 6.
\frac{3}{20}RMI_{7}
Divide 6RMI_{7} by 40 to get \frac{3}{20}RMI_{7}.
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