Which could be the first step in solving the equation represented by the model below? 3 x tiles and 4 negative 1 tiles = 2 x tiles and 5 positive 1 tiles Add 4 positive unit tiles to each side. Remove 4 unit tiles from each side. Add 6 positive unit tiles to each side. Remove 6 unit tiles from each side.Which could be the first step in solving the equation represented by the model below? 3 x tiles and 4 negative 1 tiles = 2 x tiles and 5 positive 1 tiles Add 4 positive unit tiles to each side. Remove 4 unit tiles from each side. Add 6 positive unit tiles to each side. Remove 6 unit tiles from each side.