Find x from a duplicate ratio condition

If $x + 7 : 2 (x + 14)$ is the duplicate ratio of $5 : 8$ , find $x$ .

~3 minAnswer checked instantlyDuplicate ratioProportion

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. I. Ratio, Examples I, No. 2

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).