book Maths Puzzle Numerical Ability

My question says to solve the equation and check the solution.
7= square root of 2x+3

Could you help me with this? thanks!

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book Other Question

8x + 15/x = 29

I need to show the work...I just know the answer is three but I cannot explain how I got there....HELP
x^2-19x+90=0
Solve by using quadratic formula