Question
Glen started with some balls at the beginning of a game. At the end of the first round of the game, he lost 5 balls to his friend Sean but won 9 balls from his friend Rael. At the end of the second round, he lost 4 balls to Rael but won 9 balls from Sean. In the end, Glen had 24 balls. How many balls did Glen have at first before the start of the game?
4 m

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Glen started with some balls at the beginning of a game. At the end of the first round of the game, he lost 5 balls to his friend Sean but won 9 balls from his friend Rael. At the end of the second round, he lost 4 balls to Rael but won 9 balls from Sean. In the end, Glen had 24 balls. How many balls did Glen have at first before the start of the game?