exam Maths Puzzle Numerical Ability

solve equation by completing the square

3x^2-8x=2

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exam Other Question

Please help me to solve this problem, I have solved for x,but having trouble solving for y.

2/3x + 1/6y +2/3
-y = 12 - 2x

X = 2 2/3 2x^4 - 5x^2 - 12 = 0