exam Maths Puzzle Numerical Ability

I am really having difficulty understanding this section of my algebra class.

Solve:

SQRT(3X+5)= SQRT(5X-7)

Can anyone show me the steps the solve this?

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exam Other Question

Graph f(x)=10x-3
I did i went down three than up 10/1 A rectangular swimming pool is 4ft longer than it is wide. It is surrounded by a deck 3ft wide. Find the dimensions of the pool if the area of the deck is 264ft^2.