exam Maths Puzzle Numerical Ability

i couldnt find the type of question it is but it has to do with variables on both sides of the equation 4-2w=6w

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exam Other Question

How do you deal with square roots within square roots, for example

sqrt(4 + 2sqrt3)/sqrt2?

Thank you for your help!
What should i do for this problem: Line through (1,-3) parallel to 2x-3y=7