(2+X)(7-x)/(5-x)(4+X)=1

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Solution

(2+x)(7-x) = (5-x)(4+x)
14 - 2x + 7x - x² = 20 + 5x -4x - x²
14 + 5x = 20 + x
5x - x = 20 - 14
4x = 6
x = 3/2

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