`K=[x+1]/[x-2]-[x-2]/[x^2+2x]-[-x+5]/[x^2-4] (x ne +-2)`

`K=[x+1]/[x-2]-[x-2]/[x(x+2)]-[5-x]/[(x-2)(x+2)]`

`K=[x(x+1)(x+2)]/[x(x-2)(x+2)]-[(x-2)^2]/[x(x-2)(x+2)]-[x(5-x)]/[x(x-2)(x+2)]`

`K=[x^3+3x^2+2x-x^2+4x-4-5x+x^2]/[x(x-2)(x+2)]`

`K=[x^3+3x^2+x-4]/[x(x-2)(x+2)]`

`M=x/[x+3]+[2x]/[x-3]-[3x^2+9]/[x^2-9] (x ne +-3)`

`M=[x(x-3)]/[(x-3)(x+3)]+[2x(x+3)]/[(x-3)(x+3)]-[3x^2+9]/[(x-3)(x+3)]`

`M=[x^2-3x+2x^2+6x-3x^2-9]/[(x-3)(x+3)]`

`M=[3x-9]/[(x-3)(x+3)]`

`M=[3(x-3)]/[(x-3)(x+3)]`

`M=3/[x+3]`

`#2`