Find the value of x such that - 72x- 75-715

Property: a^m× a^n=a^m+n 7^2x×7^5=7^15 7^2x+5=7^15 2x+5=15 2x=10 x=5 ...

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Question

Find the value of $x$ such that :
$7^{2 x} \times 7^{5} = 7^{15}$

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