Minor Contract Validity Concerns

Summary

Contracts involving minors in the Philippines are typically voidable, meaning they can be annulled unless ratified by a guardian. In this scenario, X, a 16-year-old, entered into an agreement with Z, which is voidable. Furthermore, Z exceeded his authority by selling Xs gaming gadgets, which was not part of their original agreement.

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Note: Voidable contracts are valid and binding until annulled
It seems like you've identified correctly that the contract between X and Z is voidable due to X being a minor. However, voidable contracts remain valid until annulled. If X or his guardian choose to annul the contract, then Z's actions of exceeding his authority by selling the gadgets could be contested.
Just to clarify, do you have any further questions about the specific steps to annul the contract or the legal obligations of Z in this case?
So with that, rephrase the first answer
Sure, here's a rephrased version of the first answer:
The agreement between X and Z is not valid. According to Philippine law, contracts involving minors (under *) are typically voidable. Since X is *, any contract he enters into can be annulled unless confirmed by a parent or guardian. Moreover, Z went beyond the agreed terms by selling the gadgets, which wasn't part of the initial deal.