exam Maths Puzzle Numerical Ability

I looked for this one, but could not find it.

3/x+1 + 2/x-1

Perform the indicated operation.

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exam Other Question

How do you solve equations like these?
Rules:Simplify but leave in radical form

1.) radical 20a^2
2.) radical 30a^7
3.) 5 radical 250

Please help
And thank you Find an equation of the line.
35) A horizontal line passing through (5/6), 0