25 баллов (математика)

9 (x+3)/[(x-1)(x+1)]-1/[x(x+1)]=(x²+3x-x+1)/[x(x-1)(x+1)]= =(x²+2x+1)/[x(x-1)(x+1)]=(x+1)²/[x(x-1)(x+1)]=(x=1)/[x(x-1)] 2)(x+1)/[x(x-1)]*x(x-1)/[3(x+1)]=1/3 10 4-2x+5=--3x 3x-2x=3-9 x=-6