exam Maths Puzzle Numerical Ability

Please help me solve this problem:
2(x-6)+2=4(x+2)-12

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exam Other Question

Please help me simplify this problem:

(sqrt a/ 3 sqrt a^2 b^3) 2/3

Answer can be written with radicals or rational exponents. the point (1,5), (4,5) and (1,0) represent three corners of a rectangle; find the coordinates of the fourth point