Evaluate
\frac{x}{13}-\frac{13}{17}
Factor
\frac{17x-169}{221}
Graph
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\frac{17x}{221}-\frac{13\times 13}{221}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 13 and 17 is 221. Multiply \frac{x}{13} times \frac{17}{17}. Multiply \frac{13}{17} times \frac{13}{13}.
\frac{17x-13\times 13}{221}
Since \frac{17x}{221} and \frac{13\times 13}{221} have the same denominator, subtract them by subtracting their numerators.
\frac{17x-169}{221}
Do the multiplications in 17x-13\times 13.
\frac{17x-169}{221}
Factor out \frac{1}{221}.
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