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2-69.

Use the eTool below to simplify the expressions on the Expression comparison Mat.
Click the link at right for the full version of the eTool: AC 2-69 HW eTool.

Go through your list of legal moves and check each move made by Sylvia.

Removing the same amount from both sides is a legal move.

Flipping tiles from the subtraction region to the addition region and changing it from positive to negative is a legal move.

Removing zero pairs is a legal move.

Removing a positive tile from the (−) region and a negative tile from the (+)region is not a legal move, because they do not make a zero pair.