6p - 0.80 = 9.52
Your goal is to isolate p.
You can add both sides by 0.80 to cancel 0,80 on left side:
6p - 0.80 + 0.80 = 9.52 + 0.80
6p = 9.52 + 0.80
6p = 10.32
Now divide both sides by 6:
6p / 6 = 10.32 / 6
p = 10.32 / 6
p = 1.72
So the cost of each gel pen is $1.72.
Hope this helps.