Septenary to duodecimal powers

Express the septenary (base‑7) number $20665152$ as a sum of powers of $12$ .

~5 minAnswer checked instantlybase conversionpositional notation

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VII. Scales of Notation, Examples VII.b, No. 12

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).