exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

If Y = 2X and 3X - 3Y = 2, then X =

I am not using any specific book. I am just practicing...

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This problem is not from my textbook it is a worksheet problem.
Use Descartes�s rule of signs to discuss the possibilities for the roots of the equation.
4x3-9x2+2x+3=0 what fraction of 45/6 is 7 and 1/4?