1. (3x^2-5x+2)(3x^2-5x-2)=21
2. (x/x+2)^2 -7(x/x+2)+12=0; x is not= -2
3. solve: a/ax-1 + b/bx-4 =a+b
4. 1/p+1/q+1/x = 1/x+p+q