What x is added to each of 9,15,21 and 3...

What x is added to each of 9,15,21 and 31 the number so obtained are in proportion . What is the mean proportion between the numbers (3x - 2) and (5x + 4) ?
9,15,21 और 31 प्रत्येक में x जोड़ा जाय तो प्राप्त संख्या अनुपात में हैं। संख्या (3x - 2) और (5x + 4) के बीच माध्य अनुपात क्या है?

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