x-1/x^2+3x+2+6/2+x-x^2-10-x/4-x^2

x-1/x^2+3x+2+6/2+x-x^2-10-x/4-x^2

Original formula = (x-1) / (x + 1) (x + 2) - 6 / (X-2) (x + 1) - (X-10) / (x + 2) (X-2)
=[(x-1)(x-2)-6(x+2)-(x-10)(x+1)]/(x+1)(x+2)(x-2)
=(x²-3x+2-6x-12-x²+9x+10)/(x+1)(x+2)(x-2)
=0/(x+1)(x+2)(x-2)
=0