An example of a(n) type your answer... \[ \frac{21}{18} \]

Step 1 ：Given the fraction \(\frac{21}{18}\).

Step 2 ：Find the greatest common divisor (GCD) of 21 and 18, which is 3.

Step 3 ：Divide both the numerator and the denominator by the GCD.

Step 4 ：The simplified numerator is 7 and the simplified denominator is 6.

Step 5 ：So, the simplified form of the fraction \(\frac{21}{18}\) is \(\boxed{\frac{7}{6}}\).