Solve for X

I put together a couple of equations for you not to actually solve for, but to break out X from. Some are first-degree equations, some are second-degree, and the difficulty varies quite a bit. Remember to post the solutions step by step as it's extremely easy to just cram the equations into an equation solver/breakout otherwise:

[list=1][*]5x(75x+32y)=5xy
[*](x+y)/(y+x)=xy
[*](x-y)/(y-x)=xy
[*]sqrt(5x)=y
[*](x+y)/(x-y)=2xy
[*](1337x)^2-(15y)^2=sqrt(y)[/list=1]