A diner makes vanilla milkshakes and chocolate milkshakes. The vanilla milkshakes machine has 300 cup capacity and 15 cups per day. The chocolate milkshake machine has 280 cup capacity and sells 20 cups per day right equation to show when the two machines will have the same amount of milkshakes left. Use X as your variable.

300 - 15X = 280 - 20X