book Maths Puzzle Numerical Ability

Please hel me solve this problem. If y = 66 and y = 2/3x - 27, what is the value of x?

I had subtracted 27 from both sides.


Thank you!!!!

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book Other Question
sqrt(54x^8)
I know the x^8 becomes x^4 but the 54 doesn't have an equal square root If you know the height and area of a trapezoid can you find the lengths of its bases?