Find the distances between parallel lines
l(x+y)+p=0 and l(x+y)-r=0

Explanation

To find the distance between the parallel lines given by the equations \( l(x+y) + p = 0 \) and \( l(x+y) - r = 0 \), we can follow these steps:

### Step 1: Identify the equations of the lines
The equations of the lines can be rewritten as:
1. \( l(x + y) + p = 0 \) → \( l(x + y) = -p \)
2. \( l(x + y) - r = 0 \) → \( l(x + y) = r \)

### Step 2: Recognize that the lines are parallel
...