You post 5 and your opponent posts 10. You act first and raise to 30, and your opponent calls with 20 more.
Your opponent acts first now and checks. You bet 30 and get called.
Another check, and you check too, which keeps the pot small with one card to come.
Your opponent bets 60. You call, because a pair of kings is a strong hand when only one player can have you beaten.
They show queen-seven for a pair of sevens. Your pair of kings takes the 240, and 120 of that was your own money.