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\frac{4\left(x-3\right)}{12}-\frac{3\left(x-4\right)}{12}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3 and 4 is 12. Multiply \frac{x-3}{3} times \frac{4}{4}. Multiply \frac{x-4}{4} times \frac{3}{3}.
\frac{4\left(x-3\right)-3\left(x-4\right)}{12}
Since \frac{4\left(x-3\right)}{12} and \frac{3\left(x-4\right)}{12} have the same denominator, subtract them by subtracting their numerators.
\frac{4x-12-3x+12}{12}
Do the multiplications in 4\left(x-3\right)-3\left(x-4\right).
\frac{x}{12}
Combine like terms in 4x-12-3x+12.
\frac{4\left(x-3\right)}{12}-\frac{3\left(x-4\right)}{12}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3 and 4 is 12. Multiply \frac{x-3}{3} times \frac{4}{4}. Multiply \frac{x-4}{4} times \frac{3}{3}.
\frac{4\left(x-3\right)-3\left(x-4\right)}{12}
Since \frac{4\left(x-3\right)}{12} and \frac{3\left(x-4\right)}{12} have the same denominator, subtract them by subtracting their numerators.
\frac{4x-12-3x+12}{12}
Do the multiplications in 4\left(x-3\right)-3\left(x-4\right).
\frac{x}{12}
Combine like terms in 4x-12-3x+12.