Shoutbox

I need some help with my kid's Algebra homework, he is about to make me pull my hair out, can someone help me with this:

Slove each equation

2x / x-4    -2   = v4/x+5   Common Dom


3/ x^2+5x+6  -  7/x+3  = x-1/x+2    Common Dom

Simplify

x^2+2x-15/  X^2+9x+20  / (x-3)

x+5/x+2 +6 Common dom

X^2-1/X+1 - X^2+1/ X-1

Algebra was 30 years ago for me, can someone help????