Evaluate
\frac{4x}{13}
Differentiate w.r.t. x
\frac{4}{13} = 0.3076923076923077
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\frac{3x+x}{13}
Since \frac{3x}{13} and \frac{x}{13} have the same denominator, add them by adding their numerators.
\frac{4x}{13}
Combine like terms in 3x+x.
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