The figure is made up of three squares overlapping as shown below. The area of square C is $$\frac{3}{7}$$ of the area of square B. The area of square B is $$\frac{7}{9}$$ of the area of square A. <hr> What fraction of the figure is unshaded? Express your answer as&nbsp;$$\frac{x}{y}$$ in simplest terms.<hr>x: <input min="0" type="number" class="lineinput" placeholder="?">&nbsp;y:<input min="0" type="number" class="lineinput" placeholder="?">