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The diagonals will be equal and so: 4x-47 = 2x+31 => 4x-2x = 31+47 => 2x = 78

Therefore the value of x is: x = 78/2 => x = 39

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Q: Diagonals of isosceles trapezoid are 4x-47 and 2x plus 31 find x?
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