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Translate the Equation Mat at right into an equation. Do not simplify your equation. Remember that the double line represents “equals.” 

Count up the number of each type of tile in each section, keeping track of the tiles' signs and whether they're being added or subtracted.

A 4 region equation mat. Positive left 2 positive unit tiles and 2 negative x tiles. Negative left 4 positive unit tiles and 1 negative x tile. Positive right 3 negative unit tiles and 2 positive unit tiles. Negative right 2 negative unit tiles and 1 positive x tile.

Shaded tile is plus 1.  Tile is negative 1.