Evaluate : `6/7-2+(-7)/9+(19)/(21)`

Explanation

To evaluate the expression \( \frac{6}{7} - 2 + \frac{-7}{9} + \frac{19}{21} \), we will follow these steps:

### Step 1: Identify the denominators
The denominators in the expression are 7, 1 (for -2), 9, and 21.

### Step 2: Find the Least Common Multiple (LCM)
To add or subtract these fractions, we need a common denominator. We will find the LCM of 7, 1, 9, and 21.

...