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\frac{3x+12}{x+4}
Since \frac{3x}{x+4} and \frac{12}{x+4} have the same denominator, add them by adding their numerators.
\frac{3\left(x+4\right)}{x+4}
Factor the expressions that are not already factored in \frac{3x+12}{x+4}.
3
Cancel out x+4 in both numerator and denominator.
Examples
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Limits
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