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A portion of a rectangle is shaded as shown. The area of the shaded region is 78 in? What is the value of x ?

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A portion of a rectangle is shaded as shown. The area of the shaded region is 78 in? What is the val...

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A portion of a rectangle is shaded as shown. The area of the shaded region is 78 in? What is the value of x ? ​

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A portion of a rectangle is shaded as shown. The area of the shaded region is 78 in? What is the value of x ?