All slots are unique, and they have their own winning lines, but you can check them anytime if you tap the ‘Paytable’ button on your current level and swipe right a couple of times.
Once you receive a winning combination, it is highlighted to see which winning line worked. Also, there could be only one winning combination on one line.
Symbols combinations are always absolutely random, and nothing influences them - everything is purely down to luck.
Here is the formula of how the winning is calculating:
Your bet/winning lines in the slot*reward for all winning icons in winning combination = reward.
bet 500,000, amount of winning lines - 25, you got 3 winning icons, for them you will receive 4 coins in reward as multiplicator:
500,000/25*4 = 20,00*4 = 80,000 coins