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If (x - 9) : (3x + 6) is the duplicate ratio of 4 : 9,find the value of x.

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If (x - 9) : (3x + 6) is the duplicate ratio of 4 : 9,find the value of x.

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 Given (x - 9) : (3x + 6) is duplicate ratio of 4 : 9.

Thus required value of x is 25.

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