Which is the correct way to model the equation negative x + 8 = 7 x + (negative 8) using algebra tiles? 1 positive x-tile and 8 positive unit tiles on the left side; 7 positive x-tiles and 8 positive unit tiles on the right side 8 positive unit tiles on the left side; 7 positive x-tiles and 8 negative unit tiles on the right side 1 negative x-tile and 8 positive unit tiles on the left side; 7 positive x-tiles and 8 negative unit tiles on the right side 8 positive x-tiles and 1 negative unit tile on the left side; 8 negative x-tiles and 7 positive unit tiles on the right side