Welcome to the random log machine (reverse version)!

Express as a single logarithm: 4 ⁄ 5 * log7 b − log7 3 − 1 ⁄ 8 * log7 a

Note: to indicate a logarithm, just write “\log”. (Without a backslash, I'll think you mean l*o*g.) To indicate the base, you use brackets, for example “\log[2]” for a logarithm with base 2.

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