Group like terms so that they can be combined.
negative x tiles, positive unit tiles, negative unit tiles, and positive tiles. If a negative and a positive tile of the same value make a zero, how many tiles are remaining?
Group like terms.
Combine like terms.
groups of . Visualize what that would look like with tiles.
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Click the link at right for the full version of the eTool: MC2 6-124 HW eTool