book Maths Puzzle Numerical Ability

Solve the equation log^8(3x-1)=log^8(x+4).

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book Other Question

The lines satsifying the equations x + dy=3 and 3y +ax=2 are perpendicular to each other find a One day in math class, shelley ask the teacher, " Mr. Nelson, how old are you?"
Mr.Nelson responds: "This year Iam 3 times as ols as my sister. How ever. 6 years ago, I was five times as old as she was". How old is the math teacher?