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\frac{3x}{12}+\frac{8\times 4}{12}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 4 and 3 is 12. Multiply \frac{x}{4} times \frac{3}{3}. Multiply \frac{8}{3} times \frac{4}{4}.
\frac{3x+8\times 4}{12}
Since \frac{3x}{12} and \frac{8\times 4}{12} have the same denominator, add them by adding their numerators.
\frac{3x+32}{12}
Do the multiplications in 3x+8\times 4.
\frac{3x+32}{12}
Factor out \frac{1}{12}.