exam Maths Puzzle Numerical Ability

Please can you help me solve x

(((3 + 3/x = 7)))

Thank you

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exam Other Question

I need help with these type of equations please,
-9h=-3(-3)
what does x equal if (1 over the square root of x minus three) minus (the square root of 2x minus 5 over x minus 3) equals 2