book Maths Puzzle Numerical Ability

Solve for x

3x^2 = 4x-2

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book Other Question
A Square with and area of 16 is partitioned into four congruent small squares. What is the area of the cirle that passes through the centers of the four similar squares? can you please help me with my problem. its about System of Linear Equations in three variables,


A Dependent system of three equations:
2x - 3y - z = 4 (1)
-6x + 9y + 3z = -12 (2)
4x - 6y - 2z = 8 (3)


please help..