If we know the area-sum and the perimeter-sum, what are the sides?

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There are four separate square enclosures, three of side \(\quantity{x}{yd.}\) and one of side \(\quantity{y}{yd.}\) The sum of the areas of the enclosures is \(\quantity{147}{sq. yd.}\) and the sum of their perimeters is \(\quantity{96}{yd.}\) Obtain two equations containing \(x\) and \(y\) and solve them.