Group the like and the unlike terms together:
$x, - 2 x, 6 x^{2}, 9 x^{3}, 4 y z^{2}, 12 z^{2} y$

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Solution

The terms having the same variables and powers are called like terms. Terms that do not have the same variables and powers are called unlike terms.

Hence $(x, - 2 x)$ and $(4 y z^{2}, 12 z^{2} y)$ are like terms and $6 x^{2}, 9 x^{3}$ are unlike terms.

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