Answer
$\log_640$
Work Step by Step
We know that $x\log_ab=\log_ab^x$ and that $\log_ab+\log_ac=\log_a(bc)$
Hence here $\log_65+3\log_62=\log_65+\log_62^3=\log_6(5\cdot2^3)=\log_640$
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