=(3-x/(2(x-2)))÷((x+2)*(x-2)/(x-2)-5/(x-2))=(3-x/(2(x-2)))÷((x+2)*(x-2)-5/x-2))=(3-x/(2(x-2)))*((x-2)/(x+2)*(x-2)-5)=(3-x)/2*(1/x*x-9)=-(x-3)/2*(1/(x+3)*(x-3))=-1/2(x+3)