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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1b This is the order of operation problem 12-2[15-3(3(4TH POWER)-2(4TH POWER)*3)} please show me how this is solve. thanks!!! how do i figure the distance from corner to corner in a square?