# Thread: Justify steps w/ property, definition, or operation: (3x + 10x) to x(3 + 10) to x(13)

1. All of you are really helpful.

2. Originally Posted by mathdaughter
I thought adding bracket is associative …
I have seen the Associative Property used to add brackets to an expression that didn't have any before. How this property is described or used sometimes depends on the instructor.

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