Question 876378
{{{(((9-x^2)/(3x+9)))/(((x^2-5x+6)/(x^2+2x+1)))=((9-x^2)/(3x+9))*((x^2+2x+1)/(x^2-5x+6))= ( (3+x)(3-x) / (3(x+3)) )*( (x+1)^2/((x-3)(x+1)) )=((3-x)/3) * ( (x+1)/(x-3) )=(3-x)(x+1)/(3(x-3))}}}
Since {{{(-1)(x-3)=-x+3=3-x}}} , {{{(3-x)(x+1)/(3(x-3))=(-1)(x-3)*(x+1)/(x-3)=(-1)(x+1)=-x-1}}}