exam Maths Puzzle Numerical Ability

Hello! I am having problems with a couple of problems and need some help.

Simplify: 50+ square root of 50 over 5

and also solve: Square root 5x+5 -15=0

Thank you for the help

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exam Other Question
Solve for y:
2x-3y=12

This is what I got:
3y=12-2x
y=12-2x over
3
y=2-4x over
3 (r^2-s^2)/(r-s)^2 divided by (r^2 -2rs +s^2)/(r^2 - rs + s^2) times (r-s)^2 divided by( r^2 -rs +s^2) times (r^3+s^3)