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(2x + 4)^2 - (x - 5)^2 = 26x
=>( 4x^2 + 16 + 16x ) - ( x^2 + 25 - 10x ) = 26x
=> 4x^2 + 16 + 16x - x^2 - 25 + 10x = 26x
=> 3x^2 + 26x - 9 = 26x
=> 3x^2 = 9
=> x^2 = 3
=> x = √3
Hence , √3 is the value of x .
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