exam Maths Puzzle Numerical Ability

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!!!

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exam Other Question

I am trying to solve the following problem and I can not figure it out.
It is writing an algebraic expression for the word phrase. Here is the problem:

The number of pages in r 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...