book Maths Puzzle Numerical Ability

Subtract 2x-3x^2+5x^3 from 5x^3+4x-x^2

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book Other Question

I need help finding the answer for 3X=-2Y+13 and 2X+5Y=16 using elimination.
I don't know how to convert it so I can use elimination on the problem. Someone please help me>>>>>>

I need to learn how to simplify the following

(3-sqrt4)*(3+sqrt4)

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