The value of \( k \), when \( 49^{\left(1-\log _{7} 2\right)}+5^{\l...

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The value of \( k \), when \( 49^{\left(1-\log _{7} 2\right)}+5^{\left(-\log _{5} 4\right)}=\frac{k}{2} \), is
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