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The area of the polygon can be calculated by finding the area of each leg separately and then adding them together.
Each leg is a rectangle with a length of 7 and a width of 5, so the area of each leg is 7 * 5 = 35 square units.
Since there are four legs, the total area of the polygon is 35 * 4 = 140 square units.
Therefore, the correct answer is:
140 square units