Question
Zeph started with some marbles at the beginning of a game. At the end of the first round of the game, he lost 4 marbles to his friend Valen but won 6 marbles from his friend Luis. At the end of the second round, he lost 6 marbles to Luis but won 6 marbles from Valen. In the end, Zeph had 18 marbles. How many marbles did Zeph have at first before the start of the game?
4 m

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Zeph started with some marbles at the beginning of a game. At the end of the first round of the game, he lost 4 marbles to his friend Valen but won 6 marbles from his friend Luis. At the end of the second round, he lost 6 marbles to Luis but won 6 marbles from Valen. In the end, Zeph had 18 marbles. How many marbles did Zeph have at first before the start of the game?