exam Maths Puzzle Numerical Ability

Solve for x:

(3)/(x) - (1)/(x + 2) = (-2)/(3x + 6)

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exam Other Question

Determine whether sqrt(-) is rational or irrational please help me
I have 2 problems I would love to see if you could help me with

x4-16 and also 3x2-12y2