Find the value of 'x' — task. Mathematics State Board, Class 8.

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Find the value of the pro-numeral \(x\) in the diagram below if \(AD =\) \(x+40\), \(BC=\) \(21 cm\) and \(DE=\) \( 42 cm\).

The value of pro-numeral \(x\) is \(cm\).

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1. Find the value of 'x'