(a-3/2a-4)/[(5/a-2)-a-2]=(a-3/2a-4)/[(5-a^2+2a-2a+4)/(a-2)]=(a-3/2a-4)*(a-2)/(9-a^2)=[a-3/2(a-2)]*(a-2)/(3-a)(3+a)=-0.5*1/(a+3) ...