x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+71+1/(x+1)-1-1/(x+3)=1+1/x+5)-1-1/(x+7)1/(x+1)+1/(x+7)=1/(x+5)+1/(x+3)(x+7+x+1)/(x^2+8x+7)=(x+3+x+5)/(x^2+8x+15)(2x+8)/(x^2+8x+7)=(2x+8)/(x^2+8x+15)(2x+8)(x^2+8x+15)=(2x+...