exam Maths Puzzle Numerical Ability

Please help me solve this equation: 1-2/3y=9/5-y/5+3/5

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exam Other Question

Find the constant term of the expansion of (x-2/x^3)^12.

I know that the constant term is independent of an x-value. I'm really confused as to how the k term is determined in or Could you please help me with this problem on hyperbolas:

Find the vertices, foci, and asymptotes. Then draw a graph.

9y^2-25x^2=225