exam Maths Puzzle Numerical Ability

For the following set, which number has the largest absolute value?
4, -1, 12, -20, 19, 0

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exam Other Question

Solve the equation: 1n x = 1n 2 + 1n(3x-1)
I know the answer is 2/5 from the answers page.
I need to know how the solution was solved.
Thank you. Add

4y/y^2 + 6y + 5 + 2y/y^2 - 1