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Lemma 7: -(-x) = x -(-x) = -(-x) + 0 = -(-x) + ((-x) + x) = (-(-x) + (-x)) + x = 0 + x = x Lemma 8: (-x) * (-y) = x * y (-x) * (-y) = -(x * (-y)) = -(-(x * y)) = x * y Theorem: If x < 0...