Help solve, I got quiz tomorow on this stuff need quick help!

Allright so tomorow I got a quiz on this stuff. I just need someone to show me step by step how to do this!

$\displaystyle

\frac{bx}{a}+\frac{1}{5}=2x$ SOLVE FOR X

$\displaystyle

\frac{3}{M}=\frac{M}{5}$ SOLVE FOR M

$\displaystyle

\frac{1}{U}=\frac{y}{k}+\frac{1}{h}$ SOLVE FOR K

$\displaystyle

\frac{V-6}{5}+\frac{V-8}{15}+\frac{V}{10}=0$ SOLVE FOR V

$\displaystyle

\frac{5}{w+3}+4=15$ SOLVE FOR w

and some similar problems that I need to isolate

$\displaystyle

\frac{K}{M}=P+\frac{a}{M^2}$ ISOLATE a

Thanks!!!